GMC Complaints

Evap emission control leak detected As the check engine light comes on, when hooking a computer up to the car for a scan it pulls a code stating there is an evap leak. The gas cap has been replaced along with a sensor and no gas is seen leaking but you can smell gas vapors when the car is running and fuel mileage is terrible. Also the stabilitrak has been an underlying issue since owning the vehicle

The contact owns a 2006 GMC Envoy. The contact stated while driving with the low beam headlights engaged, the low beams headlights failed to illuminate, causing a reduced visibility of the roadway. The contact engaged the high beam headlights and was able to continue driving. The contact stated that the failure had been recurring while driving. An unknown dealer was notified of the failure. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 15V519000 (Exterior Lighting). The manufacturer was notified of the failure. The failure mileage was unknown.

The headlight assemblies has a random blinking, flashing, flicker, on/off problem. This causes people to think I am either flashing them or blinking my light at them. Major safety concern!! GM is aware of this issue and does not have a fix. I requested a different vehicle to drive until they fix this safety issue and was denied.

The contact owns a 2017 GMC 1500 Denali equipped with Land Spider Tires, Tire Line: Wild Traxx, Tire Size: 35x121/2/R22, DOT: (N/A). The contact stated that while diving at various speeds and turning, the tires were rubbing against the sidewall. The coolant line blew out. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed that the thermostat and Oxygen sensor needed to be placed. The manufacturer was not contacted. The failure mileage was approximately 130,000. The tire failure mileage was 130,000.

The contact owns a 2015 GMC Sierra 1500. The contact stated that the vehicle shuddered upon depression of the accelerator pedal, there was no warning light illuminated. Upon investigation, the contact determined that the failure was likely caused by the torque converter. The dealer was contacted about the failure and informed the contact to take the vehicle for an inspection. The contact took the vehicle to an independent mechanic where the torque converter was flushed, and the transmission filter was replaced. Despite the repair, the contact stated that the failure worsened soon after the repair. The vehicle was taken back to the independent mechanic where the vehicle remained. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to file a complaint. The vehicle was not repaired. The failure mileage was approximately 140,000.

The contact owned a 2021 GMC Terrain. The contact stated while the brake pedal was depressed, it was released and the vehicle suddenly accelerated aggressively. The contact attempted to avoid crashing into the vehicle in front and swerved however the front of the vehicle still impacted the vehicle in front. The air bags deployed upon impact. A police report was filed. The contact stated no medical attention was provided, but did suffer bruises from the air bag and seat belt. The vehicle was towed to an independent mechanic. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was not available.

The contact owns a 2018 GMC Acadia. The contact stated that the vehicle failed to start and restart daily and required to be jumpstarted. Additionally, while the transmission was shifted into park(P), the "Shift to Park" message was displayed, and the vehicle failed to turn off, causing the battery to become drained. Roadside Assistance was able to jumpstart the vehicle. The vehicle was taken to AutoZone and Firestone, where the battery and alternator were tested; however, the cause of the failure could not be determined. The contact purchased a battery jump starter to jumpstart the vehicle. The vehicle was then taken to Pep Boys, where the alternator, battery, and starter were all tested, and it was determined that the engine switch had failed. Pep Boys advised the contact to take the vehicle to the dealer for a diagnosis. The vehicle was not repaired. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The failure mileage was 81,737.

Bought new car August 16th 2024. Few days later, I was turning left at a light and the car lost power as I was turning and error messages came up on the dash screen saying service transmission. I also observed that the cars gear indicator went to Park by itself even though the car was still moving. Pushed the engine start button and car came back on and I switched the gear to Drive. Took car in on the 19th to get looked at. Week later, driving down the city street going 40-45 MPH, car lost power again and car gear indicator switched to Park again, service transmission indicator came up and low fuel indicator came up even though I had over 1/2 a tank left. Took in to dealership on August 26th, 2024. Over this weekend, my wife was driving home from up north at a very busy freeway intersection and the car lost power again and luckily she was able to get over to the shoulder. It took some time but she was able to get the car restarted and made it home. There is something seriously wrong with this particular vehicle where we do not want to even drive it. This car has less than 500 miles on it and has lost power three times in three weeks.

The contact owns a 2018 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, the vehicle was violently shaking. While at a stop, the vehicle slammed the brake pedal, and the steering wheel was shaking. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed that the failure was due to the transmission. The mechanic test drove the vehicle, and the vehicle was shuddering and violently shaking, and the transmission was hard shifting. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 42,000.

The headlights when turned on flash/flicker from while driving at night. I see they have service bulletin but this is hazard as it temp brights other drivers as well as causing a weird issue while driving.