GMC Complaints

The GMC dealer said the engine needs to be replaced and GMC said they would pay for the majority of the cost. But that was 46 days ago and they still don’t have a replacement engine. So I have been stuck without a vehicle

On 01/24/2025, I was driving my GMC Sierra in the express toll lane at approximately 75 mph. The toll lane had two lanes and was enclosed by concrete barriers on both sides with no median or shoulder to pull over. Without warning, the engine suddenly shut off. There were no warning lights, no unusual noises—just complete engine failure. The power steering also stopped functioning, making it difficult to control the vehicle. I immediately shifted into neutral and focused on keeping the wheel steady to avoid triggering the wheel lock, which could have caused me to lose control and crash. I was forced to coast to a stop, barely managing to find a narrow sliver of space on the median of an on-ramp to the express lane. However, even then, my vehicle was still partially blocking the right lane of the express toll lane and partially in the on-ramp. There was nowhere safe to go, no way to restart the truck, and I couldn’t exit the vehicle due to high-speed traffic surrounding me on both sides. I sat in my disabled truck, utterly exposed, fearing for my life as cars sped past me at 70+ mph. I kept imagining the worst—that an inattentive driver would slam into me, causing a catastrophic accident. Thankfully, after several harrowing minutes, a police officer arrived to block traffic behind me, and another cruiser blocked the entrance to the express lane. Only then did I feel a shred of relief. This was one of the most terrifying experiences I’ve ever endured, and I wouldn’t wish it on anyone. Afterward, I learned that my 6.2L L87 engine had spun the main bearing and now requires a complete engine replacement. In researching this issue, I discovered that the NHTSA is already investigating similar failures in vehicles equipped with this engine. Alarmingly, I also spoke with my Uber driver on the way home, who told me he experienced the exact same failure in his 2023 Escalade with the 6.2L engine. Thankfully, his failure occurred at a red light rather than at highway speeds

The contact owns a 2018 GMC Acadia. The contact stated while driving at an undisclosed speed, the cruise control feature failed to function as intended. The contact stated that the vehicle exceeded the set speed. The contact deactivated the cruise control feature; however, the vehicle failed to decelerate. The contact depressed the brake pedal, however the vehicle failed to stop as intended. The contact had to repeatedly depress the brake pedal before the vehicle finally stopped. The vehicle was taken to an independent mechanic; however, the failure was not duplicated. The vehicle was not repaired or diagnosed by the independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to take the vehicle to the dealer for diagnostic testing. The failure mileage was approximately 94,000.

MANUFACTURER SAFETY RECALL ISSUED -NHTSA #21V050 - TRANSPORT CANADA #20591 - RECALL # N212328760 FRONT PASSENGER AIRBAG TAKATA INFLATOR-PRIORITY GROUP 6

The contact owns a 2013 GMC Terrain. The contact stated that when slowing down to come to a stop, the vehicle was jumping and hesitating, causing the contact to shift into neutral(N) to stop the vehicle and prevent the vehicle from shaking. There was a fuel odor that smelled like rotten eggs. The check engine warning light was intermittently illuminated at first but became a constant failure. The vehicle was previously included in the emissions recall N192268180; NHTSA Campaign Number: 10183214 (Engine and Engine Cooling); with DTC: P0420 and the vehicle was repaired; however, the contact stated that the repair was performed had not matched the repair in the Emissions recall. The contact stated that the dealer had replaced the oxygen sensor instead of the catalytic converter and oxygen sensors as stated in the remedy. The dealer was contacted and confirmed that the VIN was included in NHTSA Campaign Number: 10183214 (Engine and Engine Cooling); however, since the repair was marked completed, there were no additional repairs available due to the mileage. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The failure mileage was unknown.

I was notified at the dealership that my truck had metal in the oil that is causing the oil sensor pump to send a ln engine code. The fix is a new engine.

During a drive home from dinner, my truck engine completely turned off. I was driving around 25 mph at the time. Car when into neutral and I pulled to the side of the road. Tried to restart the truck, but couldn't not. I had to have the car towed to a dealer. Just got confirmation that my I need a new engine. Then I found that the NHTSA is investigating GMC for this very reason, so I thought I'd file a complaint. * My truck is currently at the dealership, so it is not available for inspection. * While I didn't feel my safety was at risk, If I was driving on a major highway, I may have felt differently. * Yes, problem has been confirmed by a dealership. * Vehicle has not been inspected by anyone other than the dealer. * The check engine light came on at the beginning of the drive, engine failed ~10 min later.

While driving, with no preliminary warning, the engine shut down and I lost power. System showed a "PRESS START" message on the dash. I coasted to a stop blocking traffic on a neighborhood street. After two weeks at dealership, I was notified it was engine failure, and I need a new engine. As of now, engines are on back order and there is no ETA.

In June 2021 at approximately 168,000 miles the engine suffered catastrophic engine failure while driving. I was forced to replace the engine at my cost as it was out of the original warranty. I was told the cause of the engine failure was due to low oil pressure over an extended prior of time from worn engine bearings which resulted in a dropped value in cylinder #7 and #8.

I was driving on the highway and my car signaled a "Low Oil Pressure". I pulled over and checked the oil level which confirmed I had the proper amount of oil in the engine. I turned on engine and began to drive again. Five minutes later I got a warning saying "No Oil. Turn Engine Off" and pulled over immediately. Had the car towed to GMC Beck and Masten Dealership the same day. Next day GMC Beck and Masten dealership ran diagnostics and didn't find any issues other than confirming the computer showed some "communication issues". They reset the computer system and called me and said I was good to go. I picked up my SUV and a mile away from home I notice the oil gauge was almost at zero. As I turned slowly to my street the SUV just stopped moving in the middle of a road while an 18 wheeler was behind me in a construction zone. 18 wheeler had to swerve to the right to prevent hitting me. I had the car towed again. The week after dealership called and said "you will stay in your rental and we are ordering an engine" casually. I called to understand what was going on but had to look in car forums to realize this was bigger than just a glitch in one car.