GMC Complaints

While driving on the highway at normal speed, my vehicle was operating completely normally with no warning lights, messages, or prior issues. Without any warning, the vehicle suddenly lost the ability to accelerate and felt as if it had been shifted into neutral. I immediately had to pull over to the side of the highway, as this created a dangerous situation with surrounding traffic. The vehicle had to be towed to a mechanic. Upon inspection, I was informed that a coolant line connected to the transmission had completely blew off, causing a rapid loss of transmission fluid and resulting in total transmission failure. I was told this was not due to a rusted or deteriorated clamp, but rather a sudden component failure. This vehicle has been meticulously maintained and I have owned it for less than one year. There were no prior symptoms, leaks, or warning signs leading up to this incident. This appears to be a sudden and unexpected mechanical failure, not caused by neglect or misuse. The loss of power while driving at highway speed posed a serious safety risk to myself and others on the road.

Seeing the intermittent shift to park messages when the vehicle has been shifted into park and the ignition is turned to the off position. Shifter wire harness jumper & transmission controls A malfunctioning shifter raises fears of potential rollaway accidents, even if such cases remain rare. For anyone who has to park on a slope, this fear can cause serious worry. Yes, there is a service bulletin (19-NA-206) No, this is 1 of the only problems I have had with this. The other issues I have had is the clear coating on the rims are peeling

The contact owns a 2022 GMC Yukon. The contact stated that while the vehicle was in the dealer for a recall repair for the traction control module and a systems update, the contact stated that the ABS, traction control, and electronic stability control (ESC) systems became disabled. The dealer was notified of the failure after the repair. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 58,000.

The contact owned a 2014 GMC Acadia. The contact stated that while driving at an undisclosed speed, the contact was avoiding crashing into another vehicle when the contact's vehicle crashed into a tree. The air bags did not deploy. The contact stated that some good Samaritans assisted the contact in getting out of the vehicle. The contact stated that the vehicle was totaled when it crashed into a tree. In addition, the contact stated that within 5–10 minutes later, the vehicle was engulfed in fire. The local fire department arrived and extinguished the fire. The contact stated that the vehicle was consumed in the fire. The vehicle was condemned as a total loss by the insurance company. The vehicle was towed to a local tow yard. The contact declined medical transport to the local medical center, however the following day, the contact went to the local medical center. The contact sustained cuts and abrasions on both legs and knees primarily, cuts and abrasions to the right and left arms, a large bruise on the left side of the chest, right side of chest pain, and severe pain in the right shoulder and back. In addition, the contact stated that on February 02, 2026, the vehicle was serviced for an unknown recall repair in which the driver's side air bag was replaced. The dealer was made aware of the failure. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 138,000.

While traveling northbound on I-65 on Saturday, 1/31, the 6.2L V8 engine in my 2023 GMC Sierra AT4 experienced a sudden and complete internal failure. My husband was driving and I was in the vehicle with him when the engine lost all power without any warning lights, messages, or prior symptoms. We were only able to coast into a very busy on-ramp merge lane before the truck died completely, leaving us stranded in an active traffic area for over two hours on one of the coldest days of the year, which created a significant safety risk for both of us and for other drivers. My truck was towed to the dealership. They inspected the vehicle, confirmed it was a full engine failure, and replaced the engine under warranty. The failed engine only had just over 37,000 miles on it at the time of the incident. GM was notified through the dealer’s warranty process. No other agencies have inspected the vehicle.

The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving approximately 50-65 MPH on an incline, the contact believed that the transmission was slipping or there was a misfire coming from the engine. The contact stated that the vehicle failed to restart automatically after the engine AUTO Start/Stop system was engaged after a complete stop. Additionally, the contact stated that after driving for a while, the vehicle went into LIMP Mode. The check engine warning light and other warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed. The contact related the failure to GM Campaign Number: N252515590 (Corroded Ground Strap); however, the dealer had informed the contact that the vehicle was not covered because the VIN was not included and there was no warranty coverage on the vehicle. The vehicle was not yet diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 75,000.

Driving on the interstate at speed and all of a sudden a loss of power, Christmas tree of lights on the dash and low oil pressure alarms. Engine now needs replacement.

Was driving approximately 70 miles per hour on the highway. While driving the vehicle just stopped in the middle of the highway after going 70 miles per hour. Was unable to put car in park. Car just shut off. Four police cars had to surround car due to being stuck in the middle of the highway with my small child in the car. Took an hour to get a tow truck. Being told our engine is now completely shot.

The frame of the back window is cracking allowing water to come in through the back glass. This is causing the headliner and other components such as air bags and other electrical components to get wet and damaged. This could cause risk of fire or failure of safety components within the vehicle such as air bags, cameras and other sensors. With water intrusion comes the high risk for mold to develop and cause serious health risks. GMC is aware of this issue and will not agree to repair it. A GMC dealer has inspected the glass and said it was a faulty seal but since it's not in the 3 year warranty window, it's not covered. Independent auto glass companies state they have seen this issue many times and the glass seal is faulty. GMC should do the right thing and fix this issue. This devalues the vehicle and the GMC brand and poses serious risks to driver. I have created a case with GMC and submitted photos, videos and dealership estimates for proof.

MY 2026 GMC Sierra AT4 1500 6.2 L87 engine had a catastrophic failure with only 3347 miles. It stalled twice while driving home, when pulling into my driveway it stalled a third time and would not start after that. Before having my vehicle towed to the Dealer from my home I connected my code reader and it posted code P0016. After being diagnosed by the dealer they informed me I needed an entire new engine. There were no warning lights or message prior to this failure My vehicle was purchased 9 week prior.