This video just saved me $1400! I had this exact problem, booked an appointment at the dealership and referenced the service bulletin you mentioned. The dealership called me today and told me that it would be $1400 with parts and labor. I asked them why it’s not covered under my 6 year powertrain warranty. He looked it up and it was! I didn’t pay a dime! Having bought the vehicle used, I never would have known to ask that question. Thank you so much!!
@@bigpoppa1fasho If I recall, it didn’t stop altogether, but it wasn’t working as well. When I would shut the car off, the fan would continue running for a while. Kind of sounded like a vacuum cleaner.
Same here! Had an appointment to fix this morning and found this video and just called my dealership and I know will have it fixed for free!! Saved me $1.400. Thank you!!!
This video saved me a ton of cash. When I went to the dealer and told them what the problem was, they said it wasn't cover under power train warranty. When I contacted cadillac they told me it totally was, so I went back and told them to fix it and you can call cadillac about the repair. Needless to say they covered it.Things they don't wanna tell you at the dealership. Thanks for this wonderful video that was very informative and bang on...
Update!!! Took my car to Cadillac dealership; car repaired with replacement of my thermostat covered under my powertrain warranty! They were surprised that I knew EXACTLY what was wrong with it and that it was covered under my warranty. THANK YOU FOR THIS VIDEO!!!
I’m so glad I came across this video because I just received the check engine light on, the fan is constantly on, the auto stop/start was not working and the message about the driver assist is on. So I will take it to an advance auto for diagnostic and call a Cadillac dealer to fix. My xt5 is a 2020. Thank you!!!
THANK YOU, THANK YOU!!! If it wasn’t for this video I would have paid $1,000 more for Cadillac to correct the problem that they knew existed in 2017. Unfortunately, my 6-year powertrain warranty had expired over 3000 miles before I became aware of the problem. But I was able to show this video/information to the Cadillac dealer and ask that they honor the warranty. They came back with “we will only charge you $400”, which I still think was a dirty dog thing to do. What type of country do we live in when a company can knowingly sell a defective product and don’t have to tell its customers because it isn’t considered a safety hazard? And just how much money has Cadillac made from its customers to fix a problem that they caused? $400 tells me that’s probably all it really cost to fix it. Yet, they quoted me $1,400. MAKING MONEY OFF DEFECTIVE PRODUCTS SHOULD BE A CRIME IN THIS COUNTRY! There isn’t many places where business can get away with this so why is GM allowed to do it? I pity the people who don’t go to RUclips first like I did. This person took the time to document the total history of this issued. And no doubt, saves consumers thousands upon thousands of dollars. Hats off to you, my friend!!!
I just had my water outlet (Thermostat) replaced on my 2019 Cadillac XT5 by my dealership. My vehicle had just over 54,000 miles when I encountered the "Steering Assist Reduced - Drive with Care" message on my DIC display. Before I came across your video, my local repair shop had quoted me a repair estimate of $1250.00. Wow, I just can't thank you enough.
I have a 2019 XT5 Platinum - 40,000 mi. Everything you stated in this video is exactly what my car is doing. Except, I also got a check engine light. This was an tremendously helpful video. Well done. Heading to the dealer today with knowledge to lead instead of them breaking out the parts cannon.
great stuff. I was searching to find the DIY video to resolve this problem on my 2017 XT5. I took this to the dealer after seeing this and learning it was covered under the 6year, 70k PT Warranty. Fortunately I have low miles and the problem occurred before the 6 year mark. Part is on backorder, but dealer is fixing at no cost. Gauge stayed below the C, radiator fans stayed on, auto stop stopped working, steering assist message, and P0128 code were my symptoms. Thanks David - awesome stuff.
Watched your video, followed your suggestions and now I’m waiting for the part due to a national shortage. You saved me the cost of this repair too! You are on point with everything you said. Thank you!!!
I'm waiting for the part as well. Dealership said they are backordered for weeks and have no idea when they'll be getting more. Were you able to get the part?
Was doing some searching on some issues for my mom's 2019 XT5 and came across this video. Symptoms exactly fit the bill. Amazing information. Saved her a lot of money. Was exactly the problem. Went prepared with info to dealership with service bill and her warranty info. Getting replaced under powertrain warranty. Thank you so very much for your video!
Thank you so much for sharing this video with us. I have a 2018 XT5. I saw the message with the steering advise on my dash and couldn't figure out the problem. Your information gives me the confidence to tell the dealership exactly what the problem is.
Took to dealer no parts,went home disconnected negative pole on battery left door open for an hour reconnected all good again! Don’t know how long it will last,but have ac again. Just waiting for parts to be available again. Thanks for the great video🎉
Just wanted to drop a thumbs and a thanks. Found this video searching after my wife had this light on her 2018. Called Cadillac and got the service bulletin and fixed by the dealership under warranty. Thank you!
Three years after you put this out and it's still helping people (me!). I'm in a 2018 XT5 with just over 60,000 miles. Thank you so much for having the exact information I need to get this straight at the dealership. I'm ecstatic I'm not going to be stuck with a $1,000+ repair bill.
I am in a 2019 and had appt with dealership for tomorrow. Thank heavens I decided to Google and found this video. I know they would have over charged me
Great! Today I replaced the coolant temp sensor because of the fan over speed and dic message of power steering assist issue. 2017 w/56850 mi. super happy to hear about this secret bulletin out there all these years. Learned my lesson to check all bulletins at least yearly from now on. Going back to the dealer to advise them we won't be going forward with the purchase of a 2025 XT5 or Lyriq. Thank you for this video, wished I had seen this a couple years earlier, issue happened last night.
Hi David, just wanted to let you know that you’ve earned my subscription. The information that you’ve voluntarily provided, is invaluable. Thanks so much sir.
The message popped up today and suddenly it was hot air coming out from the dash as well. I have a 2018 xt5 with 37,500 miles. Calling Cadillac tomorrow armed with warranty information. Thank you so much!
You saved me $1010. Thanks. This is a valuable service for us nontechnical people. I listened to this 3 times so I could talk to the service dept and not sound foolish. Thank you again.
@@thibaultlbt2123yes, if you have a code reader and it comes up code P0128, the error message says"steering assist is reduced drive with care", the radiator fans run like crazy and the temp gauge acts weird then the thermostat has gone bad. There is a service bulletin dated May 2017 17-NA-158 addressing this problem and should be under your 6 yr 70K mi power train warranty. My dealership had to look it up to see I was correct or I would have been charged. The part is called "water outlet". Good luck!
I just want to thank you SO much for making this video. My XT5 has done this for a year, and I’ve been to the dealership 5x for it with no fix. I forced them to watch your video, and they are finally going to replace the t-stat housing!!! They couldn’t get codes to pull up on mine either which is why there was so much back and forth. Thank you!!!!
This was great! Thank you. You described every symptom we encountered. Went to get the engine light code read. Same code you mentioned. Called the dealership service center, described exactly what you mentioned. After they checked, it was just the thermostat. Unfortunately our warranties had expired. Originally quoted $1649, but the final bill was only $1000. So glad we found your video. 🙏
I bought my XT5 Premium Luxury trim with 61K miles. So it was still under the powertrain warranty when I had the exact same code and symptoms. I called the Cadillac dealer and the person on the phone told me it was a very common problem and replacing the thermostat would take care of it. I asked him if it was covered under the powertrain warranty and he said no. So I had the code erased with a scan tool and had no more problems for a while. Then the same problems came back with the same P0128 code. Now my car is over 70k miles and if I want to get it replaced I have to pay out of pocket. It’s a shame how dealerships, even Cadillac, are scumbag crooks. If you didn’t point it out in this video, I still would’ve believed the dealer. I hope it helps others since my issue happened way before this video was made. Big thanks for doing this sir!
Hey David - count me as another extremely grateful viewer. I watched this video after looking up the P0128 code that I had pulled for free at O'Reilly. I took my 2018 XT5 into the dealership and LOOONNG story short - I picked up my car yesterday after only paying the diagnostic fee of ~$85. This video gave me what I needed to make sure I didn't get charged for repair that was under warranty. I didn't even know the powertrain warranty (6 year, 70K miles) passed through multiple owners. Thanks again!
Thanks alot for this video. Same symptoms as what you said. Called a Cadillac Dealership for our 2017 XT5 and I only had 20 days left on my 6 year Warranty, Whew! Thanks again.
Just saved me a TON of money! Thanks so much! I NEVER would have thought this was covered by the power train warranty and almost brought the car to my neighborhood repair guy. 2019 XT5 with 57k miles. So glad I listened to entire video. Thanks for posting!
Incredible video, I was just looking online to confirm the part I needed to order 🙂, the Service Bulletin and Powertrain Warranty just blew my mind!!! We have a 2018 with 62k miles and it has all symptoms you say, but we have not noticed it restarting too soon, nor anything with the AC. We called our Cadillac and have an appointment tomorrow to see what they say. You need more than a like button, just a job well done, best helpful video to the point of subject I have ever seen online. Thanks
I was going to do this repair on my 2017 Acadia but I didn't have to. Try removing the negative lead on your battery for a few moments first. It cured mine and it hasn't come back yet. It can't hurt to try. Good luck.
This issue just happened to my 2018 XT5 tonight, and I have to admit, I was scared as H***. I am a caddy girl, and this one is my 5th caddy, which April 19th will be one year since I got it... I know first hand that caddy repairs are very expensive, but my daughter found your video and I am so blessed that she did... I am the second owner of my XT5 and it's so good to know that this is covered.. Only thing is, I need my car to get back and forth to work, and I can't afford for the part to be on back order... I need my car now...Thank you Dave, this video was on point...
Steering assistance warning, crazy running radiator fan, temp gauge stay at the cold side, 90% matched, my goodness. Scan the code --- P0128. 100% matched, OMG!!! Thank you so much, you must be an engineer, your information is SO detailed, thank you! Unfortunately, warranty has expired, will watch your other video see if it's possible to fix it myself.
How much was it to fix? My 2018 XT5 has 95k miles. This happened months ago and I paid for a new battery and it fixed it. Didn’t check for the code but it worked for a year. Now I just got the steering assist reduced message again. Was thinking of trading it in.
thank you so much for the video. my 2017 XT5 had the warning sign came on during past weekend, and i brought the car in today. i missed the warranty period by 5 days! FIVE DAYS!!! the manager told me to give a 1-800 number to explain my situation (missing the warranty by 5 days ,3rd cadillac, first owner, blah blah...). I am going to give them a call tomorrow and find out. but yes, this video helped me a lot to understand what is wrong with my car. I think this would be my last cadillac and will start "leasing" other car brand instead of purchasing them...
Thank you David! I have found on my 2019 that I just reset the code and all is well. I have tested the actual temp with a high quality IR gun. It is getting hotter than LOW. Once the system gets 'stuck', all you need to do is a Code reset. This appears to me to be a 'Program issue', or a poor sensor. However, my technical education, and hands on experience tells me this is a fluke, not a Real problem. None of the true tests I ran during and after these notices, confirmed a High or Low temperature before or after the thermostat, (as far as I could determine), and the coolant was neither too hot or low. You are a wonderful spokesperson; a pleasure to listen. Thanks for your time.
I reset mine by unplugging the battery terminals a few thousand miles ago. The issue returned today on my way home… I’m wondering if I should just reset it again…
I do agree that it doesn’t seem like an actual bad thermostat or it wouldn’t have ran so good for a few thousand miles after seeming to be stuck running cold.
You’re spot on, I purchased a certified 2017 XT5 a couple of years ago with 37k on the odometer. This happened the first week of ownership. It took multiple trips to the dealership to actually pull a code, even though I had a screen shot of the dash and DIC message.
We just had our 2019 steering assist light come on......Took the info from this video to the dealer......Bottom line they covered it under the Power Train Warranty! Well done David !!! Thanks!!!!!!!!!
Thank you for the info very helpful My 2019 xt5 has an “action required “ steering assist reduced And fan running at 100% thermostat needle at C and AC is not working I would say it’s a safe bet that this is the cause Now I have the pleasant task of explaining to the service center I’ve diagnosed the problem through a you tube video Thanks again
I once had a service dept show me an issue they were trying to track down - and showed me a RUclips video they were using to assist in the troubleshooting. Turns out it was one of my videos...
I have the same issue with a GMC Acadia 2018. Was your dealership able to get the part? Mine says they're backordered and have no idea when they'll be able to get more.
So I take it in today they apparently are so busy and schedule so full I had to schedule service 2 weeks out.. but they wouldn’t take my word for it on the part and assured me they have no prob and have the part. Funny thing is about a week ago thermostat started to work again stopped getting the driver assist message and AC works. But picked up a nail in my tire and local tire place won’t repair or replace tire Explanation because tread is low and because it’s awd my only option is to replace all 4 tires and that’s the only thing they will do Lease is literally up in 8 weeks So luckily it’s still holding air and going to the dealership today and it’s car shopping time. I am so looking forward to this process:. I rather go to the dentist
Thank you for your video. Just got my water outlet replaced on my 2019 XT5 today. It only had 40K miles, so the Cadillac dealer took care of it under warranty. I talked to the mechanic and he said he has done many of these. I asked if GM had updated the water outlet part to correct the issue and he said he didn't know, but he hasn't had to do that job twice on the same vehicle. I looked at the paperwork after the repair and it looks like the water outlet part number has changed. So that must have addressed the issue. In your video you give the GM part number as 12678779. The new part number that was on my paperwork is 12678780. Thanks again for your help.
I have to thank you so much for this video. I have a 22 XT five with the same issue and previously had same issue with my 2018. Using your video I came to the dealership with the service bulletin printed with the codes and part numbers, including where to find them. Really appreciate this video. Thank you.
Thank you so much.. mine is out of warranty. I ordered the part cause the dealer was out of stock and as soon as it comes in, I’m going to try doing it myself..
Were you able to get the part? I ordered one online and it was cancelled a few days later because the parts are on backorder. Dealership said they have no idea when they'll be getting more.
Love the video. Thanks for the info. I took my car in multiple times for this issue. It was never fixed. Now I’m out of warranty and they quoted $2200 to fix.
I watched your other video on the start-stop function because my XT5 was having the exact same symptoms as yours. Sure enough, when I changed the battery, it fixed the problem. However, shortly after that, I started getting the same error message you have in this video related to the thermostat, along with my fan running at full speed and my temperature gauge not working. I found it odd that the exact same problems happened to both our cars in the same order. That's when it occurred to me that maybe this thermostat error has nothing to do with the thermostat itself. I thought maybe It's possible that when I changed the battery, the old codes weren't cleared. So, I went to my local parts shop and asked them to check the codes to see if they pointed to the thermostat. On a hunch, I asked them to wipe all the codes from the computer. To my surprise, that worked! My car is now working fine with no problems. The fan is not running at top speed, and there are no error messages. I wanted to share this message because I think many people might watch your video and then spend a lot of money to get a new thermostat put in, when all they had to do was wipe all the codes after replacing the battery.
Good information! I literally just did this repair yesterday on a customer's 2017 XT5. Thermostat was stuck open most of the time, giving the P0401 code in the Power Steering Control Module for faulty information coming from the ECM. Also, the customer complained of poor cabin heat now that it's colder weather. Flat rate was 4.4 hours for the thermostat replacement along with a $140 bill at the GM parts department for the thermostat.
Thank you soooo much for this video. I’ve had my 2018 XT5 for 4 days and the check engine light came on with this same message. AC stopped blowing cold. Dealer tried adding Freon but that didn’t work. I have 36k miles and i was going to take it back because i thought it was strange to have issues this early on. Now that i know its still covered by warranty I’ll keep it. I love my new car despite the issue at hand 😂 Thank you again
Great video. I was just quoted $1200 by my Cadillac dealer to fix this issue on my 2017 XT5 with 75000 miles. We were never notified of the GM Service issue by GM or the dealer- no doubt as a means of making the customer (me) pay for GM’s poor quality and high “design for repair” cost. Before this - my experience with GM was great. However, obviously the customer is no longer important to them. They just lost my future car and truck purchases.
Thank you... this was very helpful as this just happened tonight, glad I came across your video. Will re-watch and take notes to be ready for when I take it to the dealership.
Thank you so much for this knowlagble and proffesional video. It is great when people likw you help us out with our vehicle troubles. I just took this in to dealer. I feel like going back and showing them rhis video. Thanks again . i will chech out more of your videos.
Thanks so much for this video. It confirmed my suspicions. Never could understand the steering assist message and also the cooling fans running constant, with a stuck open thermostat. The cooling fans running constant is what put up the initial red flag to me, then i saw my temp gauge below the C. after an hour trip.
I'm having this same issue right now with my 2017 XT5 with 72000 miles I also keep getting the error message for steering assist reduced, my ac dosent blow cold, and my heat dosent heat up that well. My temp gage stays on cold and I do hear fans blowing when I stop and turn off my car and the engine light comes on. Then suddenly everything will be ok for a while. But I'm going to go ahead and get it fixed. My repair will cost $680 bucks!!! This is my 1st actual problem since purchasing this car.
I had the same issues with my 2017 XT5. The same error message " The steering assist" and the air conditioning would blow warm. These messages only came up when using the back up key fab. When I used my wife's primary key fab there were no issues. I know it sounds crazy, but I think the saved settings on the back up fab affects some of the electronic sensors including the thermostat settings.
WHOA!!!! MIND BLOWN!!!! I have had this same issue for awhile. But it comes and goes. Usually whenever I return from monthly air travel, it starts acting up. But after awhile the message will go away, the a/c will return to normal and the check engine light will go out. However after I return from the next month's trip the problem returns. I thought someone at the airport long term parking was tampering with my vehicle when I park it monthly. But it's not. I use my backup key fob when traveling so that I can leave my primary keys with the house sitter. WOW! Thank you!!!
My 2018 xt5 started doing same thing. I watched several you tube videos which other people were having similar problems. He found that toping the antifreeze reservoir off to cold fill mark reversed the steering warning, A/C only blowing hot air and radiator fan blowing at top speed. Well, I topped my antifreeze reservoir off and my car stopped all the nonsense too. It didn’t do it all at once. The temperature guage started registering after driving the car about 5 miles. Then the other issues gradually went away. My suggestion is to have the service techs take the cap off the antifreeze reservoir after it cools down and loolk inside the reservoir to check the fluid level. I couldn’t look at the reservoir and tell what the antifreeze level either. Evidentally, a small drop starts the senario I described.
Many thanks for this valuable information about the GMC ACADIA 2017 thermostat issue , Now I have that problem I am going to replace the thermostat . Iraqi Kurdistan Region Taqtaq town .
David, Thanks for your video, do you have and scan of the bulletins that you show us, because as you know in the dealer all the time when we talk about a recall or bulletin, they say they don't know, the codes appears in the scanner is the P0128 and U0422 Rear differential clutch control module, I think this two codes are crashing and make the P0128 can clear with the scanner, I need to disconnect the battery positive wire for reset the ECU, and the gauge work properly again, but it just work for a few week, it;s that because I don't think it is a thermostat.
I have the 'power steering assist is reduced' error & PO128 error. My AC also quits. This appeared 4 months ago and disappeared. It came back & I was resolved to spend ~$1000 at a local shop to avoid the dealer rates. Thanks for the tip on the power train warranty. I think I have 4 months left on my 2017 XT5 (42,000mi). Will try to report back.
I bought a code reader that also erases error codes and when I erased the code the problem went away. Either its an intermittent temperature sensor or computer monitoring error. I don't think it's mechanically related at all.
Hey everyone, just to let you know I had this problem twice and this most recent time I found out that GM has finally released just the housing itself without the pipes. It is part number 12678780. It looks like the thermostat has come out from what I can see in October 2023 and does have that new part number so I’m hoping that that fixes any future problems. Like I said this is just the thermostat housing so that you won’t have to remove it from your old Assembly, or purchase the whole pipe assembly this is just the one part and I am thrilled that GM has decided to release this and it has also released new install directions, which are far less complicated than they had been in the past. Hope this helps!
Thank you for this video! We just had this error message come up on our 2017 XT5 over the weekend. Unfortunately, we are out of warranty 😞 Getting a quote this week from the dealership for the repair. Wish us luck! 🤞
@@noereyes82 actually, it stopped giving us that error message. Weird I know but we decided to hold off on the repair for now. Guess we will see! Fingers crossed!
Omg!This is EXACTLY what my car is doing!Also, my a/c is involved as well! My radiator also has done as you described yours did. I have a 2019 xt5 premium. Love the car....hate this motor!
Thank you so very much David for this video this is EXACTLY what is going on with my 2017 XT5 I am the original owner and the car has 78,613 miles and this is the first time this has occurred. My Powertrain and Extended Warranties have all expired what recourse do I have can I go over to my Cadillac dealership and ask them to replace this under the Service Bulletin Notice? I am not looking to spend thousands of dollars to replace a thermostat and I don't have the know-how to do it on my own.
I have a PT Warranty under a 3rd party but they have said that they don’t cover a thermostat replacement. What do I need to tell them so that they know it is covered under the PT warranty because it is an engine issue?
Took my 2018 XT5 to the dealership with the same issues, coolant temp gauge stuck on cold, steering assist degraded, and the a/c only blows hot air. Two hours later they called and said come pick up the vehicle. I guess I'm very lucky they had the part in this area of Texas or they resolved the parts issue.
Your advice about the power train warranty is great, but I agree with a few people who have commented this does not seem like it's a stuck thermostat issue. For me the symptoms come and go, and I can clear all symptoms with an extended disconnect of the battery. (My XT5 is out of warranty, by the way.) Interestingly, the Service Bulletin covers the 2017 XT5 and Acadia, but it does not apply to the 2017 Buick LaCrosse, which shares the same LGX engine and the same Water Outlet. Why was the LaCrosse not included? Horsepower (310) is the same on all of the vehicles; however, torque comes in at 271 ft-lb on the 2017 XT5 and Acadia vs. 282 ft-lb on the 2017 LaCrosse. Different software? Are there any other differences that would explain the Buick LaCrosse not being affected? This seems key.
I tend to agree with you.. if it was a thermostat issue it would either overheat or not reach a good operaterating temperature but the temperature gage would not be stuck on cold. I erased the code and like a miracle the problem went away. If it was a sensor, the code would immediately come back. It did not. Everything operates perfectly, temperature gage works and everything after erasing the code.
I had the same warning but also NO AC. Before I called and tried to fix with dealer, I just disconnected the negative terminal on the battery for about 1 hour. This let the car computer reset. Problem was fixed after, no appointments, no money, no trouble.
The GM service bulletin it says (at the bottom of the page) that no parts are required for this repair. How can they say that? Not as far as the steering is concerned, yeah I get that but it won't fix the problem without replacing the thermostat and the sensor (best to replace both while the top end is ripped off it) David, did they replace both in your case?
my thermostat was replaced. The service bulletin is a starting point: "Diagnose the P0128 - Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature using procedures in SI. Once the P0128 is resolved, the Steering Gear U0401 can be cleared."
I fixed the steering assist problem and the ac not working by putting the key fob in the arm rest. You put it in, close the lid, wait a minute, start the engine. Everything went back to normal. I know, it sounds weird. But it works.
I have the same problem together with P0014, but the Onstar diagnostic says: everything is funny. I believe Cadillac should recall or do something about it. Many customers abandon the name!
I have a 2019 Acadia Denali and this steering warning light came on. I checked the antifreeze "globe" and is was below the arrows and showing low anti freeze level. Do you think this would cause this steering warning to come on?
This is a common problem with the GM 3.6 V6 at 50-60k. The dealer will replace if still under powertrain warranty; if not expect $1,200 -$1,500 bill. Dealers have a high overhead and charge a lot of money for repairs. Most professional garages (I'm not talking about the corner gas station) can fix for little more than half the cost. But it is a pain in the rear to replace, about 3-5 hours work depending on how familiar the mechanic is with the repair. I'd talk to your independent shop and politely ask them if they have experience with GM 3.6 V6 with the P0128 code. My mechanic just rolled his eyes and said "You've got to be kidding me. At least one a month."
Hello David , I was having the steering assist problem on my 2019 Cadillac XT5. I watched your video regarding this many times. I had the dealership replace my thermostat-engine coolant outlet pipe and my ECT sensor. The steering message on the dash went away as well as all of the error codes but my auto stop and my air conditioning are still not working!! Any thoughts?? They told me that it's probably separate issues but I never had auto stop or air conditioning problems prior to the steering assist issue?? I don't know much about RUclips or how to look for your response? Can you tell me were to look for your response. I really appreciate your help in this matter.
I have a 2018 XT5, the Steering Assist reduced message has come up twice in 2 months on my infotainment center but I have not gotten a check engine light in yet. Should I take it in anyway or wait for the light with a code to come up?
My temperature gage stays on cold, which would indicate the sensor, not the thermostat. If the thermostat was stuck closed, the engine would obviously overheat, and if it was stuck open, it would register something, not stay stuck on cold. I erased my codes, started my car, and the temperature gage, air conditioner, and steering assistant were all working. It seems like the issue isn't a thermostat problem and more like an intermittent sensor or computer monitoring issue.
Yes, you may right!! Cadillac has many issues about sensors. LoL So, how did u fix it? And can I drive to my regular shop distance about 20mins ?? Thanks Edd!
@turnupking31 we ended up taking our car to the dealer and the issue ended up being covered under warranty and the replaced a bunch of parts and now the problem is fixed.
Bought a 1 person owned also kept service records a 2018 Cadillac XT5 with 42,345 miles on it. Of course my sister wants to drive test it but she doesn’t know ish about cars so my mother buys it for her b-day problem so after a week later I drove it and noticed on a flat road taking my hands off the wheel for a couple of seconds it pulls to the right a little worse while breaking did this for 4 miles same thing happens it need an alignment. I took it back told them the issue plus the car came with a awesome warranty told Crown Acura in Florida what it does waited 4 hours never saw it leave the lot for a test drive I should have recorded the odometer readings. So now this Wednesday I have a 10am appointment to drop the 2018 Cadillac XT5 maroon/red at Crown Acura with Logan Lane again for the same problem but it’s staying the night and I will record the odometer reading when it’s dropped off in the back. But what’s weird each time I ask for documentation of what the mechanic or mechanics did I get nothing and I want this for my personal or rather she wants it for her records if it becomes a problem are they not suppose to give you paperwork of what the car had done on it or is it top secret? Also the odometer reading underneath the oil life supposed to disappear then reappear or stay on constant?
Having this issue. I have a 2018 XT5, base model, about 80k miles. Symptoms; Temperature gauge not reading, power steering assist reduced, fans on high wide open. Sometimes my auto stop start works sometimes it doesn't, but this has been going on way before the thermostat issue. Had I known your valuable dealership info would have taken it in, too late now. (DIY) I replaced only the temperature sending unit. Initially problem didn't go away. After replacing the temp sending unit I disconnected the battery. After doing this everything went back to normal. After about a week issue reoccurred. Once again after about a week problem reoccurred again. each time disconnecting the battery to reset the computer. I am on reoccurrence #4. Thinking about changing the thermostat, but what does this have to do with it. I can see thermostat cycle perfectly on temp gauge.
This happened to me a thousand miles past warranty. No sites have the part available. GMC stated they have the part on national control meaning you can only order from dealerships. I called my dealership and they stated they are way backordered and won't be available for weeks, if that.
This video just saved me $1400! I had this exact problem, booked an appointment at the dealership and referenced the service bulletin you mentioned. The dealership called me today and told me that it would be $1400 with parts and labor. I asked them why it’s not covered under my 6 year powertrain warranty. He looked it up and it was! I didn’t pay a dime! Having bought the vehicle used, I never would have known to ask that question. Thank you so much!!
Did you A/C stop working
@@bigpoppa1fasho If I recall, it didn’t stop altogether, but it wasn’t working as well. When I would shut the car off, the fan would continue running for a while. Kind of sounded like a vacuum cleaner.
Same here! Had an appointment to fix this morning and found this video and just called my dealership and I know will have it fixed for free!! Saved me $1.400. Thank you!!!
Having this exact problem calling GMC once they open this morning thank you so much..
@@bigpoppa1fasho mine stop working only hot air was coming out
This video saved me a ton of cash. When I went to the dealer and told them what the problem was, they said it wasn't cover under power train warranty. When I contacted cadillac they told me it totally was, so I went back and told them to fix it and you can call cadillac
about the repair. Needless to say they covered it.Things they don't wanna tell you at the dealership. Thanks for this wonderful video that was very informative and bang on...
Update!!! Took my car to Cadillac dealership; car repaired with replacement of my thermostat covered under my powertrain warranty! They were surprised that I knew EXACTLY what was wrong with it and that it was covered under my warranty. THANK YOU FOR THIS VIDEO!!!
I’m so glad I came across this video because I just received the check engine light on, the fan is constantly on, the auto stop/start was not working and the message about the driver assist is on. So I will take it to an advance auto for diagnostic and call a Cadillac dealer to fix. My xt5 is a 2020. Thank you!!!
THANK YOU, THANK YOU!!! If it wasn’t for this video I would have paid $1,000 more for Cadillac to correct the problem that they knew existed in 2017. Unfortunately, my 6-year powertrain warranty had expired over 3000 miles before I became aware of the problem. But I was able to show this video/information to the Cadillac dealer and ask that they honor the warranty. They came back with “we will only charge you $400”, which I still think was a dirty dog thing to do. What type of country do we live in when a company can knowingly sell a defective product and don’t have to tell its customers because it isn’t considered a safety hazard? And just how much money has Cadillac made from its customers to fix a problem that they caused? $400 tells me that’s probably all it really cost to fix it. Yet, they quoted me $1,400. MAKING MONEY OFF DEFECTIVE PRODUCTS SHOULD BE A CRIME IN THIS COUNTRY! There isn’t many places where business can get away with this so why is GM allowed to do it? I pity the people who don’t go to RUclips first like I did. This person took the time to document the total history of this issued. And no doubt, saves consumers thousands upon thousands of dollars. Hats off to you, my friend!!!
I just had my water outlet (Thermostat) replaced on my 2019 Cadillac XT5 by my dealership. My vehicle had just over 54,000 miles when I encountered the "Steering Assist Reduced - Drive with Care" message on my DIC display. Before I came across your video, my local repair shop had quoted me a repair estimate of $1250.00. Wow, I just can't thank you enough.
Was it just the water outlet that got changed or did they change the Censor too?
I have a 2019 XT5 Platinum - 40,000 mi. Everything you stated in this video is exactly what my car is doing. Except, I also got a check engine light. This was an tremendously helpful video. Well done. Heading to the dealer today with knowledge to lead instead of them breaking out the parts cannon.
great stuff. I was searching to find the DIY video to resolve this problem on my 2017 XT5. I took this to the dealer after seeing this and learning it was covered under the 6year, 70k PT Warranty. Fortunately I have low miles and the problem occurred before the 6 year mark. Part is on backorder, but dealer is fixing at no cost. Gauge stayed below the C, radiator fans stayed on, auto stop stopped working, steering assist message, and P0128 code were my symptoms. Thanks David - awesome stuff.
Watched your video, followed your suggestions and now I’m waiting for the part due to a national shortage. You saved me the cost of this repair too! You are on point with everything you said. Thank you!!!
I'm waiting for the part as well. Dealership said they are backordered for weeks and have no idea when they'll be getting more. Were you able to get the part?
@@BryceRoberts did you pay something?
Was doing some searching on some issues for my mom's 2019 XT5 and came across this video. Symptoms exactly fit the bill. Amazing information. Saved her a lot of money. Was exactly the problem. Went prepared with info to dealership with service bill and her warranty info. Getting replaced under powertrain warranty. Thank you so very much for your video!
Thank you so much for sharing this video with us. I have a 2018 XT5. I saw the message with the steering advise on my dash and couldn't figure out the problem. Your information gives me the confidence to tell the dealership exactly what the problem is.
Me, too.
I have the 2018 XT5 as well and got the same message and my air conditioning went out
@@pattysolis8574mines too did 😢
@@pattysolis8574 That's what just happened to me this morning! Thank you for posting that the A/C went out as well!
Took to dealer no parts,went home disconnected negative pole on battery left door open for an hour reconnected all good again! Don’t know how long it will last,but have ac again. Just waiting for parts to be available again.
Thanks for the great video🎉
Just wanted to drop a thumbs and a thanks. Found this video searching after my wife had this light on her 2018. Called Cadillac and got the service bulletin and fixed by the dealership under warranty. Thank you!
Three years after you put this out and it's still helping people (me!). I'm in a 2018 XT5 with just over 60,000 miles. Thank you so much for having the exact information I need to get this straight at the dealership. I'm ecstatic I'm not going to be stuck with a $1,000+ repair bill.
I am in a 2019 and had appt with dealership for tomorrow. Thank heavens I decided to Google and found this video. I know they would have over charged me
@@midnight62u Hopefully you're still under warranty. My 2018 may be too late for the powertrain coverage. Fun times. I'm probably stuck with it.
Great! Today I replaced the coolant temp sensor because of the fan over speed and dic message of power steering assist issue. 2017 w/56850 mi. super happy to hear about this secret bulletin out there all these years. Learned my lesson to check all bulletins at least yearly from now on. Going back to the dealer to advise them we won't be going forward with the purchase of a 2025 XT5 or Lyriq. Thank you for this video, wished I had seen this a couple years earlier, issue happened last night.
Hi David, just wanted to let you know that you’ve earned my subscription. The information that you’ve voluntarily provided, is invaluable. Thanks so much sir.
The message popped up today and suddenly it was hot air coming out from the dash as well. I have a 2018 xt5 with 37,500 miles. Calling Cadillac tomorrow armed with warranty information. Thank you so much!
You saved me $1010. Thanks. This is a valuable service for us nontechnical people. I listened to this 3 times so I could talk to the service dept and not sound foolish. Thank you again.
My English is terrible, could you please tell me what I have to explain?
@@thibaultlbt2123yes, if you have a code reader and it comes up code P0128, the error message says"steering assist is reduced drive with care", the radiator fans run like crazy and the temp gauge acts weird then the thermostat has gone bad. There is a service bulletin dated May 2017 17-NA-158 addressing this problem and should be under your 6 yr 70K mi power train warranty. My dealership had to look it up to see I was correct or I would have been charged. The part is called "water outlet". Good luck!
I just want to thank you SO much for making this video. My XT5 has done this for a year, and I’ve been to the dealership 5x for it with no fix. I forced them to watch your video, and they are finally going to replace the t-stat housing!!! They couldn’t get codes to pull up on mine either which is why there was so much back and forth. Thank you!!!!
I had to tell my dealer the problem. Parts delivery out 3-4 weeks they say. Anyone have the part in stock???
Mine just started doing this too. Did you ever feel unsafe or scared driving with it like that?
@@AbysmalOceans You should stay indoors. So much to be scared of.
I just paid 5600 at Frank Kent for this issue they said it was my compressor and powersteering
This was great! Thank you. You described every symptom we encountered. Went to get the engine light code read. Same code you mentioned. Called the dealership service center, described exactly what you mentioned. After they checked, it was just the thermostat. Unfortunately our warranties had expired. Originally quoted $1649, but the final bill was only $1000. So glad we found your video. 🙏
I bought my XT5 Premium Luxury trim with 61K miles. So it was still under the powertrain warranty when I had the exact same code and symptoms. I called the Cadillac dealer and the person on the phone told me it was a very common problem and replacing the thermostat would take care of it. I asked him if it was covered under the powertrain warranty and he said no. So I had the code erased with a scan tool and had no more problems for a while. Then the same problems came back with the same P0128 code. Now my car is over 70k miles and if I want to get it replaced I have to pay out of pocket. It’s a shame how dealerships, even Cadillac, are scumbag crooks. If you didn’t point it out in this video, I still would’ve believed the dealer. I hope it helps others since my issue happened way before this video was made. Big thanks for doing this sir!
Mine too they replaced the entire engine 2years ago. Now they don't want to fix even when it's still under warranty 😡
🤬@@ilovethegame12
This just happened to me, how long did it go after you cleared the code the first time? I just don’t want the engine to randomly blow up now
Hey David - count me as another extremely grateful viewer. I watched this video after looking up the P0128 code that I had pulled for free at O'Reilly. I took my 2018 XT5 into the dealership and LOOONNG story short - I picked up my car yesterday after only paying the diagnostic fee of ~$85. This video gave me what I needed to make sure I didn't get charged for repair that was under warranty. I didn't even know the powertrain warranty (6 year, 70K miles) passed through multiple owners. Thanks again!
Thanks alot for this video.
Same symptoms as what you said.
Called a Cadillac Dealership for our 2017 XT5 and I only had 20 days left on my 6 year Warranty, Whew!
Thanks again.
Just saved me a TON of money! Thanks so much! I NEVER would have thought this was covered by the power train warranty and almost brought the car to my neighborhood repair guy. 2019 XT5 with 57k miles. So glad I listened to entire video. Thanks for posting!
Incredible video, I was just looking online to confirm the part I needed to order 🙂, the Service Bulletin and Powertrain Warranty just blew my mind!!! We have a 2018 with 62k miles and it has all symptoms you say, but we have not noticed it restarting too soon, nor anything with the AC. We called our Cadillac and have an appointment tomorrow to see what they say. You need more than a like button, just a job well done, best helpful video to the point of subject I have ever seen online. Thanks
I was going to do this repair on my 2017 Acadia but I didn't have to.
Try removing the negative lead on your battery for a few moments first.
It cured mine and it hasn't come back yet. It can't hurt to try.
Good luck.
I erased the code with a code reader and it solved my problem.
This issue just happened to my 2018 XT5 tonight, and I have to admit, I was scared as H***. I am a caddy girl, and this one is my 5th caddy, which April 19th will be one year since I got it... I know first hand that caddy repairs are very expensive, but my daughter found your video and I am so blessed that she did... I am the second owner of my XT5 and it's so good to know that this is covered.. Only thing is, I need my car to get back and forth to work, and I can't afford for the part to be on back order... I need my car now...Thank you Dave, this video was on point...
I had the same code and bought a code reader that can erase them too. The reader pull the P0128 code, I erased it, and my car when back to normal.
Steering assistance warning, crazy running radiator fan, temp gauge stay at the cold side, 90% matched, my goodness. Scan the code --- P0128. 100% matched, OMG!!! Thank you so much, you must be an engineer, your information is SO detailed, thank you! Unfortunately, warranty has expired, will watch your other video see if it's possible to fix it myself.
How much was it to fix? My 2018 XT5 has 95k miles. This happened months ago and I paid for a new battery and it fixed it. Didn’t check for the code but it worked for a year. Now I just got the steering assist reduced message again. Was thinking of trading it in.
This video was extremely helpful. My 2017 XT5 has not experienced this yet, but now I feel prepared for it if it does occur. Thank you so much.
thank you so much for the video. my 2017 XT5 had the warning sign came on during past weekend, and i brought the car in today. i missed the warranty period by 5 days! FIVE DAYS!!! the manager told me to give a 1-800 number to explain my situation (missing the warranty by 5 days ,3rd cadillac, first owner, blah blah...). I am going to give them a call tomorrow and find out. but yes, this video helped me a lot to understand what is wrong with my car. I think this would be my last cadillac and will start "leasing" other car brand instead of purchasing them...
Thank you David! I have found on my 2019 that I just reset the code and all is well. I have tested the actual temp with a high quality IR gun. It is getting hotter than LOW. Once the system gets 'stuck', all you need to do is a Code reset. This appears to me to be a 'Program issue', or a poor sensor. However, my technical education, and hands on experience tells me this is a fluke, not a Real problem. None of the true tests I ran during and after these notices, confirmed a High or Low temperature before or after the thermostat, (as far as I could determine), and the coolant was neither too hot or low.
You are a wonderful spokesperson; a pleasure to listen. Thanks for your time.
I reset mine by unplugging the battery terminals a few thousand miles ago. The issue returned today on my way home… I’m wondering if I should just reset it again…
I do agree that it doesn’t seem like an actual bad thermostat or it wouldn’t have ran so good for a few thousand miles after seeming to be stuck running cold.
You’re spot on, I purchased a certified 2017 XT5 a couple of years ago with 37k on the odometer. This happened the first week of ownership. It took multiple trips to the dealership to actually pull a code, even though I had a screen shot of the dash and DIC message.
Ohhh no i have my 2019 Cadillac XT5 and did the same thing
We just had our 2019 steering assist light come on......Took the info from this video to the dealer......Bottom line they covered it under the Power Train Warranty! Well done David !!! Thanks!!!!!!!!!
Took my mum's 2019 to the dealer today. No work performed... because it never set a code.
Thank you for the info very helpful
My 2019 xt5 has an “action required “ steering assist reduced
And fan running at 100% thermostat needle at C and AC is not working
I would say it’s a safe bet that this is the cause
Now I have the pleasant task of explaining to the service center I’ve diagnosed the problem through a you tube video
Thanks again
I once had a service dept show me an issue they were trying to track down - and showed me a RUclips video they were using to assist in the troubleshooting. Turns out it was one of my videos...
I have the same issue with a GMC Acadia 2018. Was your dealership able to get the part? Mine says they're backordered and have no idea when they'll be able to get more.
So I take it in today they apparently are so busy and schedule so full I had to schedule service 2 weeks out.. but they wouldn’t take my word for it on the part and assured me they have no prob and have the part. Funny thing is about a week ago thermostat started to work again stopped getting the driver assist message and AC works. But picked up a nail in my tire and local tire place won’t repair or replace tire Explanation because tread is low and because it’s awd my only option is to replace all 4 tires and that’s the only thing they will do
Lease is literally up in 8 weeks
So luckily it’s still holding air and going to the dealership today and it’s car shopping time. I am so looking forward to this process:. I rather go to the dentist
Ditto!
Its A Detailed Video To Me. Explained Very Well. Theres Already Alot Of Videos Showing How To DIY But Dont Explain Anything. Great Video!
Thank you for your video. Just got my water outlet replaced on my 2019 XT5 today. It only had 40K miles, so the Cadillac dealer took care of it under warranty. I talked to the mechanic and he said he has done many of these. I asked if GM had updated the water outlet part to correct the issue and he said he didn't know, but he hasn't had to do that job twice on the same vehicle. I looked at the paperwork after the repair and it looks like the water outlet part number has changed. So that must have addressed the issue. In your video you give the GM part number as 12678779. The new part number that was on my paperwork is 12678780. Thanks again for your help.
Was it just the water outlet or did they replace the censor too?
@@coreyvalach5512 Just the water outlet/thermostat.
Thanks so much! My 2018 xt5 has the same problem at 53,000 miles
I have to thank you so much for this video. I have a 22 XT five with the same issue and previously had same issue with my 2018. Using your video I came to the dealership with the service bulletin printed with the codes and part numbers, including where to find them. Really appreciate this video. Thank you.
Thank you so much.. mine is out of warranty. I ordered the part cause the dealer was out of stock and as soon as it comes in, I’m going to try doing it myself..
Were you able to get the part? I ordered one online and it was cancelled a few days later because the parts are on backorder. Dealership said they have no idea when they'll be getting more.
I have a 2019 with 34000 miles the warning just popped up on my dash yesterday. Thanks, I'm calling my dealer in the morning.
I have this message thank you for posting all your research, TSB information and part number for thermostat. You earned my subscription!!
Love the video. Thanks for the info. I took my car in multiple times for this issue. It was never fixed. Now I’m out of warranty and they quoted $2200 to fix.
I watched your other video on the start-stop function because my XT5 was having the exact same symptoms as yours. Sure enough, when I changed the battery, it fixed the problem.
However, shortly after that, I started getting the same error message you have in this video related to the thermostat, along with my fan running at full speed and my temperature gauge not working. I found it odd that the exact same problems happened to both our cars in the same order.
That's when it occurred to me that maybe this thermostat error has nothing to do with the thermostat itself. I thought maybe It's possible that when I changed the battery, the old codes weren't cleared. So, I went to my local parts shop and asked them to check the codes to see if they pointed to the thermostat.
On a hunch, I asked them to wipe all the codes from the computer. To my surprise, that worked! My car is now working fine with no problems. The fan is not running at top speed, and there are no error messages.
I wanted to share this message because I think many people might watch your video and then spend a lot of money to get a new thermostat put in, when all they had to do was wipe all the codes after replacing the battery.
Thanks so much Dave, I am calling GM after already replacing the coolant temp sensor myself and still have the 128 code
You also have to clear the code before things will go back to normal.
The problem just started on my 2019 XT5 with 25,000 miles on it. Thank you so much for the great information.
Good information! I literally just did this repair yesterday on a customer's 2017 XT5. Thermostat was stuck open most of the time, giving the P0401 code in the Power Steering Control Module for faulty information coming from the ECM. Also, the customer complained of poor cabin heat now that it's colder weather. Flat rate was 4.4 hours for the thermostat replacement along with a $140 bill at the GM parts department for the thermostat.
My mechanic also found temp sensor was defective
Thank you soooo much for this video. I’ve had my 2018 XT5 for 4 days and the check engine light came on with this same message. AC stopped blowing cold. Dealer tried adding Freon but that didn’t work. I have 36k miles and i was going to take it back because i thought it was strange to have issues this early on. Now that i know its still covered by warranty I’ll keep it. I love my new car despite the issue at hand 😂
Thank you again
This is the most helpful/informative youtube video i have ever watched. Thank you!!
Great video. I was just quoted $1200 by my Cadillac dealer to fix this issue on my 2017 XT5 with 75000 miles. We were never notified of the GM Service issue by GM or the dealer- no doubt as a means of making the customer (me) pay for GM’s poor quality and high “design for repair” cost. Before this - my experience with GM was great. However, obviously the customer is no longer important to them. They just lost my future car and truck purchases.
Happy I found your channel, 2017 XT5 with 25k miles just started doing this. Found no codes with my reader, but getting the drive assist message.
Thank you soooooo much!!!! The powertrain warranty covers everything!!! You are a lifesaver!!!!!!
Thank you for this video! my 2017 XT5 Started this yesterday at 29,000 miles Heading to the dealer on Monday With lots of knowledge thanks to you🙏🏽
Thank you... this was very helpful as this just happened tonight, glad I came across your video. Will re-watch and take notes to be ready for when I take it to the dealership.
Mine is 2019,, EXACTLY as you described,,, I’ll let y’all know if my dealer is honorable soon ,,,, many thanks for this fantastic video 🙏
Thank you so much for this knowlagble and proffesional video. It is great when people likw you help us out with our vehicle troubles. I just took this in to dealer. I feel like going back and showing them rhis video.
Thanks again . i will chech out more of your videos.
Thanks so much for this video. It confirmed my suspicions.
Never could understand the steering assist message and also the cooling fans running constant, with a stuck open thermostat.
The cooling fans running constant is what put up the initial red flag to me, then i saw my temp gauge below the C. after an hour trip.
Thanks for your valuable information. I reminded the dealership about my power train warranty and had the thermostat replaced for free.!
Great information, everything you stated was right on. This is exactly what's going on with my XT5 2018. Thank you!
I'm having this same issue right now with my 2017 XT5 with 72000 miles I also keep getting the error message for steering assist reduced, my ac dosent blow cold, and my heat dosent heat up that well. My temp gage stays on cold and I do hear fans blowing when I stop and turn off my car and the engine light comes on. Then suddenly everything will be ok for a while. But I'm going to go ahead and get it fixed. My repair will cost $680 bucks!!! This is my 1st actual problem since purchasing this car.
Appreciate your valuable information. my lite came in today. going to make an appointment with my dealer .
Thanks so much sir!
I had the same issues with my 2017 XT5. The same error message " The steering assist" and the air conditioning would blow warm. These messages only came up when using the back up key fab. When I used my wife's primary key fab there were no issues. I know it sounds crazy, but I think the saved settings on the back up fab affects some of the electronic sensors including the thermostat settings.
WHOA!!!! MIND BLOWN!!!! I have had this same issue for awhile. But it comes and goes. Usually whenever I return from monthly air travel, it starts acting up. But after awhile the message will go away, the a/c will return to normal and the check engine light will go out. However after I return from the next month's trip the problem returns. I thought someone at the airport long term parking was tampering with my vehicle when I park it monthly. But it's not. I use my backup key fob when traveling so that I can leave my primary keys with the house sitter. WOW! Thank you!!!
My 2018 xt5 started doing same thing. I watched several you tube videos which other people were having similar problems. He found that toping the antifreeze reservoir off to cold fill mark reversed the steering warning, A/C only blowing hot air and radiator fan blowing at top speed. Well, I topped my antifreeze reservoir off and my car stopped all the nonsense too. It didn’t do it all at once. The temperature guage started registering after driving the car about 5 miles. Then the other issues gradually went away. My suggestion is to have the service techs take the cap off the antifreeze reservoir after it cools down and loolk inside the reservoir to check the fluid level. I couldn’t look at the reservoir and tell what the antifreeze level either. Evidentally, a small drop starts the senario I described.
Hi. Can you share the video you watched? Thank you very much!
2018 XT5. Same problem at 95,000. Thx for the video
Great video! My dealer confirmed its covered under powertrain warranty
Perfect...exactly as described. All symptoms...will wait to see what Cadillac say....will keep you posted.
Thank you so much for the info! My 2019 is doing exactly the same thing and dealership said it wasn't covered. Thank you
Thank you. So ironic your video popped up in my RUclips recommendations as I just started having this problem in my 2017 3 days ago.
Many thanks for this valuable information about the GMC ACADIA 2017 thermostat issue , Now I have that problem I am going to replace the thermostat .
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Taqtaq town .
David, Thanks for your video, do you have and scan of the bulletins that you show us, because as you know in the dealer all the time when we talk about a recall or bulletin, they say they don't know, the codes appears in the scanner is the P0128 and U0422 Rear differential clutch control module, I think this two codes are crashing and make the P0128 can clear with the scanner, I need to disconnect the battery positive wire for reset the ECU, and the gauge work properly again, but it just work for a few week, it;s that because I don't think it is a thermostat.
I have the 'power steering assist is reduced' error & PO128 error. My AC also quits. This appeared 4 months ago and disappeared. It came back & I was resolved to spend ~$1000 at a local shop to avoid the dealer rates. Thanks for the tip on the power train warranty. I think I have 4 months left on my 2017 XT5 (42,000mi). Will try to report back.
I bought a code reader that also erases error codes and when I erased the code the problem went away. Either its an intermittent temperature sensor or computer monitoring error. I don't think it's mechanically related at all.
Hey everyone, just to let you know I had this problem twice and this most recent time I found out that GM has finally released just the housing itself without the pipes. It is part number 12678780. It looks like the thermostat has come out from what I can see in October 2023 and does have that new part number so I’m hoping that that fixes any future problems. Like I said this is just the thermostat housing so that you won’t have to remove it from your old Assembly, or purchase the whole pipe assembly this is just the one part and I am thrilled that GM has decided to release this and it has also released new install directions, which are far less complicated than they had been in the past. Hope this helps!
Thank you for this video! We just had this error message come up on our 2017 XT5 over the weekend. Unfortunately, we are out of warranty 😞 Getting a quote this week from the dealership for the repair. Wish us luck! 🤞
How much was the damage?
@@noereyes82 actually, it stopped giving us that error message. Weird I know but we decided to hold off on the repair for now. Guess we will see! Fingers crossed!
Omg!This is EXACTLY what my car is doing!Also, my a/c is involved as well! My radiator also has done as you described yours did. I have a 2019 xt5 premium. Love the car....hate this motor!
Thank you so very much David for this video this is EXACTLY what is going on with my 2017 XT5 I am the original owner and the car has 78,613 miles and this is the first time this has occurred. My Powertrain and Extended Warranties have all expired what recourse do I have can I go over to my Cadillac dealership and ask them to replace this under the Service Bulletin Notice? I am not looking to spend thousands of dollars to replace a thermostat and I don't have the know-how to do it on my own.
I have a PT Warranty under a 3rd party but they have said that they don’t cover a thermostat replacement. What do I need to tell them so that they know it is covered under the PT warranty because it is an engine issue?
Took my 2018 XT5 to the dealership with the same issues, coolant temp gauge stuck on cold, steering assist degraded, and the a/c only blows hot air. Two hours later they called and said come pick up the vehicle. I guess I'm very lucky they had the part in this area of Texas or they resolved the parts issue.
Hmmm.... Did the invoice show they used any parts?
@@DavidWaltermyer removed and replaced the thermostat.
Mine failed today at 30,300 mi. 2018 ct6. Thankfully the dealer did it under warranty
Your advice about the power train warranty is great, but I agree with a few people who have commented this does not seem like it's a stuck thermostat issue. For me the symptoms come and go, and I can clear all symptoms with an extended disconnect of the battery. (My XT5 is out of warranty, by the way.) Interestingly, the Service Bulletin covers the 2017 XT5 and Acadia, but it does not apply to the 2017 Buick LaCrosse, which shares the same LGX engine and the same Water Outlet. Why was the LaCrosse not included? Horsepower (310) is the same on all of the vehicles; however, torque comes in at 271 ft-lb on the 2017 XT5 and Acadia vs. 282 ft-lb on the 2017 LaCrosse. Different software? Are there any other differences that would explain the Buick LaCrosse not being affected? This seems key.
Not sure but I never had the issue again so 🤷♂️
I tend to agree with you.. if it was a thermostat issue it would either overheat or not reach a good operaterating temperature but the temperature gage would not be stuck on cold. I erased the code and like a miracle the problem went away. If it was a sensor, the code would immediately come back. It did not. Everything operates perfectly, temperature gage works and everything after erasing the code.
Vehicle will go into failsafe mode again shortly. You will end up replacing the thermostat.
@@Pinoy915 I used an OBD tool to clear the code.
Hi. Is it just the thermostat "water outlet" that needs replacing? Or does the censor need replacing and re programing as well?
Thank you, I have a 2020 xt5 with same problem. Good content!
I had the same warning but also NO AC. Before I called and tried to fix with dealer, I just disconnected the negative terminal on the battery for about 1 hour. This let the car computer reset. Problem was fixed after, no appointments, no money, no trouble.
The GM service bulletin it says (at the bottom of the page) that no parts are required for this repair. How can they say that? Not as far as the steering is concerned, yeah I get that but it won't fix the problem without replacing the thermostat and the sensor (best to replace both while the top end is ripped off it) David, did they replace both in your case?
my thermostat was replaced. The service bulletin is a starting point: "Diagnose the P0128 - Engine Coolant Temperature (ECT) Below Thermostat Regulating
Temperature using procedures in SI. Once the P0128 is resolved, the Steering Gear U0401 can be
cleared."
Thank you so much for this video!!!! I'm still under drivetrain warranty.
My man! Just happened headed to dealership tomorrow 😅
I fixed the steering assist problem and the ac not working by putting the key fob in the arm rest. You put it in, close the lid, wait a minute, start the engine. Everything went back to normal. I know, it sounds weird. But it works.
How many years does this have to go on before they correct it? Crazy. Time to shop for Lexus!
I have the same problem together with P0014, but the Onstar diagnostic says: everything is funny. I believe Cadillac should recall or do something about it. Many customers abandon the name!
Thank you so much for the video. I have a 2018 and the problem the same, but the millage is 130k km, then I will not be covered, right?
What is the video on the process to get to the thermostat, so you can replace it?
I have a 2019 Acadia Denali and this steering warning light came on. I checked the antifreeze "globe" and is was below the arrows and showing low anti freeze level. Do you think this would cause this steering warning to come on?
Our GMC Denali has this issue. Our GMC dealer is waiting for t stats. I have been disconnecting the negative battery cable to reset the ECM.
There needs to be a recall on this poorly designed part. Typical GM thinking: piss customers off to save a buck.
Thanks!
This is a common problem with the GM 3.6 V6 at 50-60k. The dealer will replace if still under powertrain warranty; if not expect $1,200 -$1,500 bill. Dealers have a high overhead and charge a lot of money for repairs. Most professional garages (I'm not talking about the corner gas station) can fix for little more than half the cost. But it is a pain in the rear to replace, about 3-5 hours work depending on how familiar the mechanic is with the repair. I'd talk to your independent shop and politely ask them if they have experience with GM 3.6 V6 with the P0128 code. My mechanic just rolled his eyes and said "You've got to be kidding me. At least one a month."
Hello David , I was having the steering assist problem on my 2019 Cadillac XT5. I watched your video regarding this many times. I had the dealership replace my thermostat-engine coolant outlet pipe and my ECT sensor. The steering message on the dash went away as well as all of the error codes but my auto stop and my air conditioning are still not working!! Any thoughts?? They told me that it's probably separate issues but I never had auto stop or air conditioning problems prior to the steering assist issue?? I don't know much about RUclips or how to look for your response? Can you tell me were to look for your response. I really appreciate your help in this matter.
I have a 2018 XT5, the Steering Assist reduced message has come up twice in 2 months on my infotainment center but I have not gotten a check engine light in yet. Should I take it in anyway or wait for the light with a code to come up?
My temperature gage stays on cold, which would indicate the sensor, not the thermostat. If the thermostat was stuck closed, the engine would obviously overheat, and if it was stuck open, it would register something, not stay stuck on cold. I erased my codes, started my car, and the temperature gage, air conditioner, and steering assistant were all working. It seems like the issue isn't a thermostat problem and more like an intermittent sensor or computer monitoring issue.
Yes, you may right!! Cadillac has many issues about sensors. LoL
So, how did u fix it? And can I drive to my regular shop distance about 20mins ??
Thanks Edd!
How do you erase the codes, I just got mine and week ago and I'm having the exact problem as well as all the symptoms
@turnupking31 i bought a engine code reader that had the ability to clear the codes.
@turnupking31 we ended up taking our car to the dealer and the issue ended up being covered under warranty and the replaced a bunch of parts and now the problem is fixed.
Bought a 1 person owned also kept service records a 2018 Cadillac XT5 with 42,345 miles on it. Of course my sister wants to drive test it but she doesn’t know ish about cars so my mother buys it for her b-day problem so after a week later I drove it and noticed on a flat road taking my hands off the wheel for a couple of seconds it pulls to the right a little worse while breaking did this for 4 miles same thing happens it need an alignment. I took it back told them the issue plus the car came with a awesome warranty told Crown Acura in Florida what it does waited 4 hours never saw it leave the lot for a test drive I should have recorded the odometer readings. So now this Wednesday I have a 10am appointment to drop the 2018 Cadillac XT5 maroon/red at Crown Acura with Logan Lane again for the same problem but it’s staying the night and I will record the odometer reading when it’s dropped off in the back. But what’s weird each time I ask for documentation of what the mechanic or mechanics did I get nothing and I want this for my personal or rather she wants it for her records if it becomes a problem are they not suppose to give you paperwork of what the car had done on it or is it top secret? Also the odometer reading underneath the oil life supposed to disappear then reappear or stay on constant?
Having this issue. I have a 2018 XT5, base model, about 80k miles. Symptoms; Temperature gauge not reading, power steering assist reduced, fans on high wide open. Sometimes my auto stop start works sometimes it doesn't, but this has been going on way before the thermostat issue. Had I known your valuable dealership info would have taken it in, too late now.
(DIY) I replaced only the temperature sending unit. Initially problem didn't go away. After replacing the temp sending unit I disconnected the battery. After doing this everything went back to normal.
After about a week issue reoccurred. Once again after about a week problem reoccurred again. each time disconnecting the battery to reset the computer. I am on reoccurrence #4. Thinking about changing the thermostat, but what does this have to do with it. I can see thermostat cycle perfectly on temp gauge.
This happened to me a thousand miles past warranty. No sites have the part available. GMC stated they have the part on national control meaning you can only order from dealerships. I called my dealership and they stated they are way backordered and won't be available for weeks, if that.
Were you able to get the part?