3.0L Diesel FIX - Radiator Fan Stuck On High? Used Block Heater? 2021 GMC Sierra 1500 Duramax
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- Опубликовано: 27 янв 2022
- I wanted to create this video as I struggled with this issue for a couple days... basically, i plugged in the engine block heater on my Sierra 3.0 Diesel Duramax and it caused the ECU to flip a code, or made the ECU think the truck was in danger of overheating and basically the radiator fan went on full blast, every time i started the truck and wouldn't stop. So the fan was stuck on high and wouldn't turn off unless I turned off the truck... frustrating. My truck didn't pop an actual code or pop the check engine light, but some reported that it did, so in your case, if you did pop a code, be sure to clear it prior to disconnecting battery. Or you can try clearing it and then let the truck sit overnight, though I don't know if that will work.
This bug caused my truck not to get up to temperature and I had no heat in the truck so it wasn't fun. If you want to avoid this issue, don't use your engine block heater unless it is below zero while plugged in and started. I figured out how to fix it after trying a few things (disconnect the battery for a little while) but here is the permanent fix for those who are going to get service from GM soon:
gm-techlink.com/?p=12389
Here is what GMC has to say about it and the permanent fix:
Some 2020 Silverado 1500 and Sierra 1500 models equipped with the 3.0L diesel engine (RPO LM2) (Fig. 12) may have the engine cooling fans running continuously for an extended period of time. The Check Engine MIL also may be illuminated.
Currently, an engine calibration in the Engine Control Module (ECM) will falsely set DTC P0111 (Intake Air Temperature (IAT) Sensor 1 Performance), which occurs when the engine block heater is used in ambient temperatures above 0°F/-18°C. As a result, the cooling system will go into remedial action and turn on the cooling fans at 100%. The remedial action will continue until the engine goes through a six hour cold soak.
If this condition is found, clear the DTC and return the vehicle to the customer. Do not perform any further diagnosis or replace any related components. An updated calibration will be available shortly.
Also inform the customer to avoid engine block heater use in temperatures above 0°F/-18°C. While the owner’s manual states an engine block heater should be used in temperatures less than 0°F/-18°C, it isn’t vital until much lower temperatures of less than -13°F/-25°C. 
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Hey I wanna personally thank you. I got a brand new 2023 Silverado with the new Duramax. It did this to me this morning it’s only have 800 miles on it so I unplugged the battery plugged it back in after 15 just like you said, I really appreciate people like you who help others thanks again.
Your welcome!!! Glad it helped! Good luck!
I don’t use a block heater on mine and my truck started doing this a few months ago. Just disconnected the negative side for 15-20 and it worked! Engine light off now and the fan isn’t going at light speed anymore! Thanks! Hopefully it stays this way and I don’t have to do this constantly lol
Crazy right? Glad u got it worked out and didn't have to go to the dealer for an hour! Haha
@@BustMonk I wish I could say it lasted lol it made it half the day before it all started doing the same shit again 🤦♂️ then randomly this week, check engine light goes away and the fans are normal for 2 days. Now it’s back to being the most annoying thing ever lol
Thanks had the same problem on my 2023 Silverado in colder weather. Tried the disconnect today with the battery and all is well again. Appreciate the post.
Your welcome! Take care
I have 2023 gmc Sierra 1500 with same engine, today my fan have same issue, working non stop with 25 degree outside. Drove it dealerships and no appointment’s one week in advance, they don’t have loaner car me and don’t even know if I can drive home like that. Paying $1500 monthly and not even deserve drive loaner car😢😢. Decide drive one hour home like that and was very disappointed with this car which is not even two months old and have this issue. Arrived home and checked google what guys say’s about this type of issue and found your video, honestly not been sure if it’s will work for me but decided to try, why not? Disconnected negative wire like you said and left it about 45 min and miracle happened it working properly. Thank you so much for posting it.
And forgot to say dealer connect a computer and printed like 10 pages with issues but no any warning lights in the car, car has 1650 miles
Your welcome! Take care!
2023 Silverado RST with the 3.0 LZO durmax. Plugged the truck in overnight when the weather said it would be 3° next morning started it and the fan turned on full blast and ran everytime the truck was on. Driving or not. Disconnecting the battery for 20 mins solved this issue. I won't be plugging the truck in until its like -10° or so. Thanks for the information. You earned a like and subscribe.
Great fix man! I had a P2CBB show up in my ‘21 Sierra Duramax yesterday and it gave me the countdown of miles before it limited my speed. DEF was full but I did notice the radiator fan was roaring. I disco’d the battery and walla fixed. Great advice.
It was 1 degree in utah I plugged my brand new 2023 lzo trailboss in and it did the exact same thing. Thanks for posting.
Your welcome! Take care!
Dude! Thank you for posting this! Helped me out!
According to GM, you really don’t need to plug it in until -13°F even though the manual says 0°F and below. Good to know. Glad I saw your video before our Yukon w/ 3.0 Dmax comes in. Fortunately The weather usually doesn’t go below 0°F where I live.
Mine did this even though I've never plugged it in. This fix still worked.
Wow that's pretty wild!
Worked like a charm on a 2023 AT4, thanks. Only thing after starting it back up, it asked me roll up and down both driver and passenger windows. Thanks again!
Glad it helped you out! Strange in the window thing tho
Thanks, my 23 with 900 miles did the same thing, I took off the negative for 5 minutes and all is good
Thanks so much. This worked great on my 2021 AT4.
Thanks brother have the issue right now with the same truck….
Going to give that a try and will update
Happened this morning on my 2020 3.0 . Did what you said, so far so good. Have been plugging mine in during winter since new. 60 k on it. First time it has happened, go figure. Thanks again
Glad it helped
Thanks man, sucks that we even need to do this on a new vehicle, but my 2021's fan is back to normal after disconnecting and re-connecting. Mine really doesn't like cold weather..only issues I've had pop up are when we hit lower than -25 celcius up here in the great white north. Cheers and thanks again for the info!
So glad it helped!
Thanks for the info!
Thank you you save my trip
You saved my trip
So I have 540 miles on mine and this just happened!! 2023 3.0 and will be calling the dealer just to see if this will be a continuing problem or software update that might be available…..Your thoughts
Thanks for your information…..
I have a 23 with 1100 miles on it and the fan started running non stop this morning. It's at the dealer now. I had no engine light on but dealer stated a code was stored for EGT sensor. Curious, did your issue come back in time after the fix of disconnecting the neg. terminal?
really thanks buddy
Worked perfect
Hey is this really all it took to fix? Has it happened again since? Thanks
Same issue with 2021 dura , but getting code 1010. Dealership said have to replace temp sensor. Sounds like bs.
My 2021 gmc 3.0 is roughly doing the same thing but engine light comes on with the code p1098. Going to try this and hopefully it helps
Has this work for you as I have the same Code P1098 popping up. And fan comes on. After Turing off my truck and clearly code it's normal again. But couple days later it happens again. Not to cold in Atlanta GA and I don't use a engin block heater. Please let me know if this work for you
J’ai le même problème, Denali 2023 2450km et après avoir utilisé le block Heather la fan du radiateur tourne à son maximum…. Merci et je fais essayer de déconnecter la batterie pour remédier à la situation……. À suivre
Any fixes yet? Disconnect battery dosnt fix it permanently, had happened 3 times now, 1 time was not plugged in block heater.
My dealer said nothings wrong, no know issue
Same here, going to dealer tomorrow to het it looked at. Getting a P1098 code
Please post if you get any answers
I’ve had this happening on and off for about 6 months. They just found that the Coolant Control Valve needs replaced and should be available by June.. Today my truck just started leaking coolant (crack in the radiator on a seam). Also back ordered.
This ever happen to you again after you fixed it?
No. I read the software update they applied fixed it.
I didn't plug anything and just started doing it !!
Same thing happened to me and a check engine light but nothing else. It drives fine and doesn’t overheat or get hot. Transmission temp stays normal as well
@Quentin I just unplug battery and worked!!
I have the same issue. GMC sucks all American vehicles are garbage. Toyota or nissan now