2020 Chevrolet Silverado 2500 electrical problems

Filed Oct 25, 2026 · Brakes, Electrical · AK

Trailer brakes keep disconnecting and connecting . Warning pops up on dash to check trailer connections. I may not happen for a hundred miles or does it 10 or 12 times in just a few miles.I've seen several complaints from on line reports but no solutions from GM yet. Very frustrating when trying to pull a trailer.

Filed Sep 15, 2026 · Electrical · TX

My vehicle was taken to Legacy Chevrolet of Waxahachie where a routine recall notice was addressed. During the process they technician broke my battery terminal. Upon my discovery the dealership claimed the broken terminal must have just broke on its own during the time it was at their dealership in spite of the ECM module update requiring the technician to specifically remove the battery cable from that specific terminal. Legacy has refused to address this issue and charged me for the new batteries as well as for the tow that was required. The damage was caused by their technician and all of the costs incurred should have been absorbed by the dealership.

Filed Aug 10, 2026 · Electrical · 126,000 miles · AZ

The contact owns a 2020 Chevrolet Silverado 2500. The contact stated that while driving at undisclosed speeds and towing a trailer, the message "Trailer Brake Disconnected" was displayed with an audible chime. The vehicle was inspected by the dealer, but no fault was found with the vehicle. Upon investigation, the contact discovered Service Update Program: N232414840; and associated the failure with the service update. The dealer and the manufacturer confirmed that the vehicle was not included in the program. The vehicle was not repaired. The failure mileage was approximately 126,000.

Filed Jun 25, 2026 · Electrical · OH · fire

I got to my destination and got out of the truck and like a hour later I came back to my truck to get in and my truck was full of smoke and stunk and my center console and center dash melted and gone . Nothing would work . That’s all I know

Filed Mar 12, 2026 · Driver assistance, Electrical · CA

This vehicle does not recognize that the gear is on park. Due to the issue, it has left me stranded twice. The first time it was at a very remote area up in the mountains. I was stuck for hours due to battery dying. The second time being a very dangerous situation Because it was a very dangerous area late at night.

Filed Feb 12, 2026 · Electrical, Fuel system · MD

On approximately January 24, 2026 my 2020 Chevrolet Silverado 2500HD equipped with the 6.6 Duramax Diesel displayed an error code (P20B9). This error code was found to be related to the diesel exhaust fluid system specifically relating to "Reductant Heater A Control Circuit/Open." On January 27, 2026, the vehicle was diagnosed at Chevrolet dealership and the following was reported "Diesel Emissions Fluid Tank Remove and Replace - P20B9 SET FOR REDUCTANT HEATER CIRCUIT...COMMANDED ON AND ZERO AMPS..CIRCUITFAILURE... DISCONNECT PUMP MODULE AND BURNED/OVERHEATED TERMINALS..PUMP MODULE AND HARNESS PART OF TANK ASSEMBLY... LABOR TIME ADDED TO PERFORM MALFUNCTION/TAMPER TEST TO CLEAR EMISSIONS MESSAGE...." I found the "burned/overheated terminals" comment to be alarming. I looked into this matter further and found a GM Service Bulletin (21-NA-006) from October 2022. This bulletin identified this issue which contained an image showing burned/overheated terminals. The identified cause within the bulletin states "This condition may be caused by a poor connection at the Emission Reduction Fluid Tank electrical connector." I believe this should upgraded to a safety recall due the the potential of this terminal connection catching fire which could be detrimental for the operator, passengers, property, and the public.

Filed Jun 6, 2025 · Electrical · ID

Power tailgate opening unexpectedly. Tailgate opens and closes without warning. The same issue that Safety Recall N232426400 describes.

Filed May 8, 2025 · Electrical · PA

The tailgate would open and close on its own. I was about ready to connect my fifth wheel RV for a trip when suddenly as I closed the truck door to back up I saw that the tailgate had opened. I proceeded to put it in park and the tailgate closed on its own. Got out as leaving the door to the pickup I walked to the rear of the truck to notice the tailgate open and close on its own. I am expecting this issue to be recalled for a repair as I have read that 2024 has this same issue and that they will be recalling trucks from 2020-2024.The issue is due to a faulty relay when wet. This vehicle is equipped with power-unlatching tailgate. I believe if this issue would have went unnoticed and continued to hook up my fifth wheel the damage would have been horrific. Thanking you in advance, Sincerely, [XXX] . INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 27, 2024 · Electrical, Engine · NM · fire

We just arrived to our out to town destination and exited the vehicle. We drove 80 miles to get there. The truck was running when we noticed white smoke coming from under the hood then immediately large red flames.

Filed Apr 3, 2024 · Brakes, Electrical · TN

Rear wheels locked up while driving/accelerating. Happened 5 times, 4 times while towing a camper once without towing. Luckily no harm or damage came to anyone. Traded in at dealership due to safety concerns after no diagnostics found anything “wrong”. It is already listed for sale, but I don’t think It’s been addressed or fixed.