Thank you so much! It worked! I’m using Chevy Volt 2012, and I was able to fix the issue by following the steps here. Couple of tips: 1. Make sure you buy the coolant mentioned in this video and/or check with local Chevy dealership to get the right coolant (50/50). 2. Your code reader does not need to be the same model, it needs to be OBD2 scanner with a capacity to erase error codes. 3. Please turn off engines and system for the car when you refill your coolant. Also, do so when the engine is cool (at night/dawn/early morning) because the coolant will explode when the engine is still hot. Thanks again! Subscribed! Just saved $500!
Omg.... This worked for me.. Though I didn't need to take the whole plastic shield off, I just bent back the flimsy "tamper proof" metal lol. It's pretty thin, I think anyone can do it. Anyway, this is the ONLY video I found on RUclips about this issue. Thank you SO much... Charging is much cheaper for me than gas, so this solution has literally saved me money! Thank you, thank you, thank you!
My 2014 Chevy Volt, 70k miles, after a long 2K road trip gave me the Service High Voltage Charging System. Feel VERY thankful I came across this Low Coolant video. It was 100% correct. I filled the Left Hand side of the front coolant tank with 50/50DexCoolant and had a friend Clear the codes and now the Volt is taking a charge. I seriously doubt the local Dealership would have just added Coolant.
Thank you very much for this video and giving me confidence that a "good enough" OBD II scanner could be used for this. The fix worked for my 2015 Volt which showed the SHVCS message and had the P1FFF code ("Coolant Level Sensor Fault") for the first time this weekend. I topped up the Dexcool mixture to the specified level (it was a tad low) and ordered a "get it done" OBD II scanner from Amazon (Ancel AD410). I turned on my Volt and plugged in the scanner. It took me some time to work through the menus and clear the code, but once I found the option to clear it, it cleared instantly and the SHVCS message on the dash disappeared. It's back to charging like normal. Thanks again.
Topped off the battery coolant, cleared code with my hptuners, all good for a few days now. Great video, would never guess low coolant could trip a service engine light and "service high voltage charging system" message.
To follow up on this, message ended up coming back after a couple charge cycles. And would keep coming back. The final fix was to order a coolant level sensor defeat plug ($40), buy a VCX Nano ($125), and a GM TDS subscription ($40), then reprogram both the BECM and HPCM2 and clear the codes afterward (the permanent codes HPTuners can't clear). Getting the VCX Nano software set up took longer than anything else in this whole process. Hook the nano up to your laptop, let the drivers install, disable anti-virus, install the software, then open up VCI manager (should see an image with a green checkmark), open VCX Manager and update the license (leave VCI Manager open any time you're doing anything with the Nano, including programming). When you go to the ACDelco TDS website, open a Chrome browser as an Administrator and log in. Has to be done that way to install some more software from their website. Hope this saves someone else some hours of frustration later down the road.
The solution works great if the coolant level gets low, just refill and clear the error like you suggested and worked great. Keeping a eye on the coolant level now no issue to date. Last road trip 3477.4 Texas to NY and back and 2013 Volt still going strong... (Great video thanks Chris) See you on the Volt forms...
Chris, in my case it wasn't potential, it was THE fix! Thanks for taking the time to provide this information. I took it to my mechanic and it was fixed in 15 minutes at no charge, and no more sleepless nights.
This worked perfectly. Thanks. Inside the reservoir is a sensor and if the fluid level gets low, it will give you that error code. My son had one of those $10 OBD code readers and erased the error code.
Came back to MN after 3 months and I was so worried some mice chewed through some wires when it was in storage, so glad it was just a simple 13 dollar fix
Okay - I did this procedure and it worked. A few notes. First nearly any Dex-Cool 50/50 mixture you buy is going to use deionized water. I bought Prestone brand but Peak, Shell Zone and AC Delco also have it. I tried clearing the error code by removing the battery cable but that didn't work. So I bought the cheapest ($20) OBD reader at Walmart and cleared all the codes and it worked fine. I had to have the ignition on but the engine off. Just press the start button for about 10 seconds without pressing the brake to get the ignition on.
Thanks so much, this simple fix did the trick and immediately after topping coolant off and clearing codes it worked. There wasn't any code that came up on my '14 volt, but still pressing clear codes was able to reset the sensor.
@@davidoan yeah you know what it lasted for some time and then it came back I think a couple of months. I still have a code pop up intermittently. On rare occasion I will have to pull over and shut the car off because of performance issues but so far I haven't been stranded yet.
@@davidoan My understanding is once you trip this code, it will recurr occasionally until you permanently clear by reflashing the entire Volt firmware! This seems to be what has happened to me so far, as the error has come back a few times (coolant not low) and reset with generic scanner only seems to fix it temporarily.
@@green1eng This was my problem with my 2012 Volt. Error would "clear" but reappear every time. Fortunately their was a recall on my volt and the dealership cleared the code in the process of fixing the recall issue. But now I let the engine coolant fall below the required level and the problem is back.
I have to reset mine every day. I also need to replace the pump for the heater to work on battery for the 3rd time in 4 years, car just turned 58000 miles. If not for these problems the car would be great.
Must use a 50/50 mix of Dexcool and deionized water. Best just to buy premixed coolant. Also, the error code is stored in the hybrid PCM, not the engine PCM, so most scantools won't be able to clear it. There is also a TSB to replace the battery coolant level sensor with a revised part. It costs about $20. The original sensor is prone to falsely detecting low coolant level.
Thanks, Chris! I followed your directions and my 2014 Volt is now charging. My OBD reader saw the code but it froze and wouldn't let me erase. I took it to my friendly mechanic and he erased it for free. For now it's working great. Very helpful!!
@@harishgudipati9666 I did everything with the car on and it worked fine I turned it off after the reader said erase complete and turned it back on and the code didn’t show up. I plugged in my car just did it tonight and it’s charging currently.
I have a 2013 Volt with 42,000 miles. Every single year, on the same day October 14, that error message pops up. Turns out that the dealer to which I took the car years ago for the state inspection preprogrammed the error to pop up so that I would have to bring the car back to them. I have a duty to report so now I have to waste countless hours putting together a forensic case and forwarding it to the Federal government to prosecute Chevrolet for fraud. I am never buying a Chevrolet anything again!
Hey Chris, Just got the SERVICE HIGH VOLTAGE SYSTEM and found out i had to replace the front radiator/ Auxiliary. Not that its been replaced, how do i go about the reset. Do I turn the car on with the hood down and reset? Leave the car off and reset? Have it plugged in? Have to put it in service mode (open the hood) and turn it on? How did you do it. Thanks. Great Video.
Here in louisiana, we have entered our three days of fall. I'm really guessing that the dip in temperature caused the coolant to condense slightly so I'll need to add more because it's got 110,000 miles on it and hasn't been topped off since it had about 20,000.
2013 with 56k.. I cleared my codes after checking coolant levels. They weren't low. I checked the level switch too.. Eventually permanent codes got set and there was nothing I could do. Took it to the dealer and they "reprogramed the battery management system." No parts replaced. 300 bucks.
It may have only needed to be reprogrammed to clear the code. The coolant level sensor is the problem. The problem is that the entire tank will have to be replaced because it is built in. There are sensor defeat devices out there to bypass and not replace the tank.
@@atortiz The level sensor is NOT built into the tank - it is fully removable, and works via magnetic sensing of the float inside the coolant tank. You just have to slide the sensor forward (towards front Chevy logo) to remove it. It requires some effort, so it helps to use two hands to slide it out.
I have the same exact scanner. The directions in the scanner says to place the car in the on position but do not start it. So exactly how did you clear the codes?
Mine is popping up the code gradually more persistent after clearing the code with my Bluetooth scanner and after tipping off the coolant reservoirs! Mine did not have the coolant levels that low. (Topped odd only about an inch)
Chris Walter my volt had the same coolant issue, fixed and It drove for a little while and about 2 mo later the entire car won't work. Seems to be a battery issue this time but even the generator won't turn on
The problem could be coolant level sensor. You might need to replace. In some instances, owners actually installed a defeat plug for it. For details go to the Chevy Volt DIY and Repair group in Facebook.
Hey Chris, I'm having same issue on my 2013 volt 170k miles. Coolent level is at proper level but I keep getting the same codes on my reader that I keep clearing out 1. P0aa6 2.p1e00 3. P1fff do you have any suggestions what it could be causing
Do not use Dex Cool 50/50. You must use a special part number dealer coolant that uses deionized water and that's because of what happens to water exposed to electrical fields in the system. Just call dealer parts they will explain.
Chris Walter . I just try it today on my 2014 volt and did work perfectly. But i notes the charge drop from 30 mile to 27 mile !! Do u think its because of that or because its been cold
If it just a little low then I would say you couls drive it but if you dont see any coolant at all then I wouldnt drive it but with mine I couldnt use my 220 charger but I was avle the use the 120 charger,
![Kumamoto Masters Japan 2024 | Gregoria Mariska Tunjung (INA) [5] vs. Akane Yamaguchi (JPN) [2] | F](http://i.ytimg.com/vi/EIjZybhsWqA/mqdefault.jpg)
We have a 2012 Ampera and this worked!!! I'm still amazed but so grateful for this video! Greetings from the Netherlands!😃
4 years later, Thank you Chris! Saved me $200 on my Volt by refilling coolant myself and taking to a mechanic to reset the codes!
Thank you so much! It worked! I’m using Chevy Volt 2012, and I was able to fix the issue by following the steps here.
Couple of tips:
1. Make sure you buy the coolant mentioned in this video and/or check with local Chevy dealership to get the right coolant (50/50).
2. Your code reader does not need to be the same model, it needs to be OBD2 scanner with a capacity to erase error codes.
3. Please turn off engines and system for the car when you refill your coolant. Also, do so when the engine is cool (at night/dawn/early morning) because the coolant will explode when the engine is still hot.
Thanks again! Subscribed! Just saved $500!
Omg.... This worked for me.. Though I didn't need to take the whole plastic shield off, I just bent back the flimsy "tamper proof" metal lol. It's pretty thin, I think anyone can do it. Anyway, this is the ONLY video I found on RUclips about this issue. Thank you SO much... Charging is much cheaper for me than gas, so this solution has literally saved me money! Thank you, thank you, thank you!
My 2014 Chevy Volt, 70k miles, after a long 2K road trip gave me the Service High Voltage Charging System. Feel VERY thankful I came across this Low Coolant video. It was 100% correct. I filled the Left Hand side of the front coolant tank with 50/50DexCoolant and had a friend Clear the codes and now the Volt is taking a charge. I seriously doubt the local Dealership would have just added Coolant.
Thank you very much for this video and giving me confidence that a "good enough" OBD II scanner could be used for this. The fix worked for my 2015 Volt which showed the SHVCS message and had the P1FFF code ("Coolant Level Sensor Fault") for the first time this weekend. I topped up the Dexcool mixture to the specified level (it was a tad low) and ordered a "get it done" OBD II scanner from Amazon (Ancel AD410). I turned on my Volt and plugged in the scanner. It took me some time to work through the menus and clear the code, but once I found the option to clear it, it cleared instantly and the SHVCS message on the dash disappeared. It's back to charging like normal. Thanks again.
Topped off the battery coolant, cleared code with my hptuners, all good for a few days now. Great video, would never guess low coolant could trip a service engine light and "service high voltage charging system" message.
To follow up on this, message ended up coming back after a couple charge cycles. And would keep coming back. The final fix was to order a coolant level sensor defeat plug ($40), buy a VCX Nano ($125), and a GM TDS subscription ($40), then reprogram both the BECM and HPCM2 and clear the codes afterward (the permanent codes HPTuners can't clear).
Getting the VCX Nano software set up took longer than anything else in this whole process. Hook the nano up to your laptop, let the drivers install, disable anti-virus, install the software, then open up VCI manager (should see an image with a green checkmark), open VCX Manager and update the license (leave VCI Manager open any time you're doing anything with the Nano, including programming).
When you go to the ACDelco TDS website, open a Chrome browser as an Administrator and log in. Has to be done that way to install some more software from their website. Hope this saves someone else some hours of frustration later down the road.
The solution works great if the coolant level gets low, just refill and clear the error like you suggested and worked great. Keeping a eye on the coolant level now no issue to date. Last road trip 3477.4 Texas to NY and back and 2013 Volt still going strong... (Great video thanks Chris) See you on the Volt forms...
Chris, in my case it wasn't potential, it was THE fix! Thanks for taking the time to provide this information. I took it to my mechanic and it was fixed in 15 minutes at no charge, and no more sleepless nights.
This worked perfectly. Thanks. Inside the reservoir is a sensor and if the fluid level gets low, it will give you that error code. My son had one of those $10 OBD code readers and erased the error code.
Did it stay off or just temporarily?
Came back to MN after 3 months and I was so worried some mice chewed through some wires when it was in storage, so glad it was just a simple 13 dollar fix
Just followed the steps in this video today, and I was able to fix the same issue on my Volt. Thank you!
Okay - I did this procedure and it worked. A few notes. First nearly any Dex-Cool 50/50 mixture you buy is going to use deionized water. I bought Prestone brand but Peak, Shell Zone and AC Delco also have it. I tried clearing the error code by removing the battery cable but that didn't work. So I bought the cheapest ($20) OBD reader at Walmart and cleared all the codes and it worked fine. I had to have the ignition on but the engine off. Just press the start button for about 10 seconds without pressing the brake to get the ignition on.
Do you hook up the OBD reader after ignition is on, or before?
@@nextgen3277 Does not matter. I do it before.
Thanks so much, this simple fix did the trick and immediately after topping coolant off and clearing codes it worked. There wasn't any code that came up on my '14 volt, but still pressing clear codes was able to reset the sensor.
Hey Jon: I am just curious if this fix was permanent. Did the error message (Service High Voltage System) ever come back? Appreciate your feedback.
@@davidoan yeah you know what it lasted for some time and then it came back I think a couple of months. I still have a code pop up intermittently. On rare occasion I will have to pull over and shut the car off because of performance issues but so far I haven't been stranded yet.
@@davidoan My understanding is once you trip this code, it will recurr occasionally until you permanently clear by reflashing the entire Volt firmware! This seems to be what has happened to me so far, as the error has come back a few times (coolant not low) and reset with generic scanner only seems to fix it temporarily.
@@green1eng This was my problem with my 2012 Volt. Error would "clear" but reappear every time. Fortunately their was a recall on my volt and the dealership cleared the code in the process of fixing the recall issue. But now I let the engine coolant fall below the required level and the problem is back.
Proper coolant level is to the TOP OF THE BLACK LABEL.
The fill level should be in the range of the black sticker. Sometimes a simple negative battery removal for 15 minutes can do wonders.
@Benjamin Martin Why not? Seems to fix many other issues.
Not for the Ev volt car!😞
Unfortunately doesnt work on the Volt as you said 😅 @@budcar9040
I have to reset mine every day. I also need to replace the pump for the heater to work on battery for the 3rd time in 4 years, car just turned 58000 miles. If not for these problems the car would be great.
Must use a 50/50 mix of Dexcool and deionized water. Best just to buy premixed coolant. Also, the error code is stored in the hybrid PCM, not the engine PCM, so most scantools won't be able to clear it. There is also a TSB to replace the battery coolant level sensor with a revised part. It costs about $20. The original sensor is prone to falsely detecting low coolant level.
The original sensor is... The suspense is killing me.
You gots part number for that?
Where do i find this " There is also a TSB to replace the battery coolant level sensor with a revised part. It costs about $20." Thank you
@@ethanwilber8739 Here is a link to the TSB: static.nhtsa.gov/odi/tsbs/2013/SB-10052204-6977.pdf
Thanks, Chris! I followed your directions and my 2014 Volt is now charging. My OBD reader saw the code but it froze and wouldn't let me erase. I took it to my friendly mechanic and he erased it for free. For now it's working great. Very helpful!!
I also bought a used 2014 volt recently and got this error, do i have to turn off the engine while doing this? any suggestions appreciated!
@@harishgudipati9666 I did everything with the car on and it worked fine I turned it off after the reader said erase complete and turned it back on and the code didn’t show up. I plugged in my car just did it tonight and it’s charging currently.
I have a 2013 Volt with 42,000 miles. Every single year, on the same day October 14, that error message pops up. Turns out that the dealer to which I took the car years ago for the state inspection preprogrammed the error to pop up so that I would have to bring the car back to them. I have a duty to report so now I have to waste countless hours putting together a forensic case and forwarding it to the Federal government to prosecute Chevrolet for fraud. I am never buying a Chevrolet anything again!
I'm not sure that's possible.
Great video man. Thank you.
Anymore maintenance or repair tips would be greatly appreciated
This seems to have fixed mine, thanks.
I guess time will tell if it stays fixed after resetting the fault code :P
Thanks, Chris the fix worked just like you explained! Aweseome!
Hey Chris, Just got the SERVICE HIGH VOLTAGE SYSTEM and found out i had to replace the front radiator/ Auxiliary. Not that its been replaced, how do i go about the reset.
Do I turn the car on with the hood down and reset?
Leave the car off and reset?
Have it plugged in?
Have to put it in service mode (open the hood) and turn it on?
How did you do it. Thanks.
Great Video.
Thanks for the great video. Everything I needed to know was covered here
Thanks Chris..worked exactly like you said! Appreciate ya
Thanks, worked like a charm. It's funny, I have that same orange code reader.
Here in louisiana, we have entered our three days of fall. I'm really guessing that the dip in temperature caused the coolant to condense slightly so I'll need to add more because it's got 110,000 miles on it and hasn't been topped off since it had about 20,000.
2013 with 56k.. I cleared my codes after checking coolant levels. They weren't low. I checked the level switch too.. Eventually permanent codes got set and there was nothing I could do. Took it to the dealer and they "reprogramed the battery management system." No parts replaced. 300 bucks.
Ah lol, you had probably old firmware not updated. Why you have to pay for that? Out of warranty? This is a service recall things. Well yeah....
It may have only needed to be reprogrammed to clear the code. The coolant level sensor is the problem. The problem is that the entire tank will have to be replaced because it is built in. There are sensor defeat devices out there to bypass and not replace the tank.
@@atortiz The level sensor is NOT built into the tank - it is fully removable, and works via magnetic sensing of the float inside the coolant tank. You just have to slide the sensor forward (towards front Chevy logo) to remove it. It requires some effort, so it helps to use two hands to slide it out.
Thanks man. It worked for me
What kind of car reader ?? model and price please
It should be up to the sticker now
What brand was that machine again
worked for me
Thanks !! It worked.
I have the same exact scanner. The directions in the scanner says to place the car in the on position but do not start it. So exactly how did you clear the codes?
Hold the start button without holding the brake and wait for the ignition to turn on. Takes a few seconds.
Mine is popping up the code gradually more persistent after clearing the code with my Bluetooth scanner and after tipping off the coolant reservoirs! Mine did not have the coolant levels that low. (Topped odd only about an inch)
The coolant level sensor is the problem. There are sensor defeat devices out there to bypass and not replace the tank.
Thanks for the video. Did you ever find out if there was a leak?
I don't think it's leaking, still running just fine.
Chris Walter my volt had the same coolant issue, fixed and It drove for a little while and about 2 mo later the entire car won't work. Seems to be a battery issue this time but even the generator won't turn on
Is good for remove codes and charge the car, bat you have to fix the problem, because don’t will pass smog check .
2:36 What is the name of the coolant? Deck Coolant 5050?
Only buy it at the dealer or you will damage your battery.
hey bro did the exact thing on my 11 volt and the check engine came back on can it be something else?
The problem could be coolant level sensor. You might need to replace. In some instances, owners actually installed a defeat plug for it. For details go to the Chevy Volt DIY and Repair group in Facebook.
I can’t wait to sell the volt I have. Soon as this thing charges it’s getting sold.
Hey Chris, I'm having same issue on my 2013 volt 170k miles. Coolent level is at proper level but I keep getting the same codes on my reader that I keep clearing out 1. P0aa6 2.p1e00 3. P1fff do you have any suggestions what it could be causing
I’m having the same thing happen to my 2013. Any solutions ?
Did you ever find a solution? Same as me!
It is not a coolant issue for me. Looking for solution.
What kind of reader is that?
Thanks for the video. It fixed it for 2 weeks then light when off again. I know i have a leak somewhere. Is there a video to replace radiator?
Why do you say the light went off? Can we assume you mean it came on. When diagnosing problems be specific we are not discussing fireworks!
should not u also remove the air after filling it up?
Do not use Dex Cool 50/50. You must use a special part number dealer coolant that uses deionized water and that's because of what happens to water exposed to electrical fields in the system. Just call dealer parts they will explain.
there is a second cap that don't have a lock on it do you know what that reservoir is for, thanks Bert
I believe that is just the normal engine/radiator coolant not 100% sure
Chris Walter . I just try it today on my 2014 volt and did work perfectly. But i notes the charge drop from 30 mile to 27 mile !! Do u think its because of that or because its been cold
This shouldn't affect your mileage. But a change in temperature will definitely affect it. My range tends to swing between 45 and 27
That second cap without the lock is for the power electronics. Charger and VFD/inverter.
Would i be ok to drive if the coolant was low?
If it just a little low then I would say you couls drive it but if you dont see any coolant at all then I wouldnt drive it but with mine I couldnt use my 220 charger but I was avle the use the 120 charger,
thumbs up. a bit better camera work would help :)