GMC Complaints

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving 55 MPH, the vehicle started making a knocking sound. There were no warning lights illuminated. The contact picked up his son from school and drove the vehicle to the dealer. The contact stated that while depressing the accelerator pedal, the knocking sound became louder, and the vehicle was losing motive power. The vehicle was taken to a dealer and diagnosed with engine failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 58,522.

Fuel line rubs between cab and tank making a hole. Fuel pours out on when driving or running. Huge fire risk. Glad I caught it before the car burned up with us in it.

In July of 2023, my wife and kids were driving to San Diego from Phoenix. About 40 miles west of El Centro, CA, all the lights on the dash came on instructing her to pull over. When she pulled over and shut the car off, it would not come back on. Got towed back to a GM Dealership in El Centro. The diagnosed it with a bad radiator and failed engine. The replaced both(at roughly 30,000 miles). The car was fine for about six months and then it started getting battery drains again, which continually happened starting a few months after purchasing the vehicle. They never could figure this part out. Anyway, early January of 2025, while driving back to Phoenix from San Diego, the car did the same thing. This time, it restarted and she could continue on her way home. On [XXX], while driving in town, the same thing happened, all lights came on, pulled over and car would not restart. It is diagnosed with the same issue. It has been in the shop at Van GMC since January 12th, 2025 waiting on a new engine, at 63,000 miles. This will be the 3rd engine in the vehicle. By looking online, this appears to be a common issue and happens more than it should. This needs to be addressed. My wife has our kids in this vehicle a majority of the time and this is a major safety issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While traveling at highway speed, without warning, check engine light started flashing. Pulled off the highway at the next exit and vehicle died in the middle of the road. Towed vehicle to mechanic who inspected vehicle and found no compression (zero psi) on cylinder 1 indicating a major engine failure, rendering engine unrepairable and the vehicle worthless. Either cam, lifter, piston failure in cylinder 1 causing massive engine failure and making the engine unrepairable due to metal shavings in the engine. This is the L87 engine, 6.2L V8 that has been plagued by problems by millions of GM owners. This car had been meticulously serviced and maintained with regularly scheduled full synthetic oil changes. The car have no indication of engine problems beforehand until the engine blew up at highway speeds.

While car is in park, I get the "Shift To Park" warning after driving the vehicle.

While driving on interstate transmission would “lock up” momentarily creating drastic drop in speed and unable to shift gears and accelerate. “D” would start flashing in dash board. Dealership said this is unrelated to current recall about rear wheels locking up from valve body failure and instead this is an electrical issue. Dealership also stated this is the 2nd truck in a week they have had come in with this issue. Almost caused accident on interstate with my family and I as a result of sudden drop in speed and unable to accelerate with multiple cars behind us.

While driving down a two-lane highway, the vehicle unexpectedly lost power and shifted into neutral. We coasted to a stop and pulled into a driveway, at which point the vehicle would not restart. The vehicle was towed to the local GM dealership, where we were informed that the engine required replacement.

My vehicle was 8 months old and it completely stopped with no warning going down the interstate, I was in the left lane and the vehicle locked up, engine and all leaving me stranded in the left lane on a busy interstate. When the engine quits, there is absolutely no way to get the vehicle into neutral to get it to a safe location. When this happened I was almost hit by an 18 wheeler . After having the vehicle towed to the dealership, they informed me the engine was seized. It took 3 months to get an engine from GM, they finally got the engine in, started it up in the shop, it apparently ran for about 15 minutes before losing oil pressure. At that time they shut the vehicle off, pulled the oil filter, found metal shavings in it and GM told the dealer to order another engine. But there were no engines available. The dealership finally notified me 3.5 months later that they finally received an engine and were working on installing it. I finally got my vehicle back after more than 6 months at the dealership and it was on its 3rd engine. I drove the vehicle for almost 2 years before the Same thing happened, the vehicle locked up on the highway and I had to have it towed. It has taken the dealer over a month to diagnose the problem and called to inform me the engine had seized up again. This will be the fourth engine in a 2022 GMC Yukon AT4. Besides the issue of the engines going bad, it is a severe safety issue that the vehicle will completely lock up on the highway with no way to move it. Twice I have almost been in a serious accident because of this.

Driving on a road. Suddenly the engine shut off and would not turn back on. I was stuck in the middle of the road with out the ability to put the truck in neutral to push it out of the way.

Valve Body. While driving the vehicle, hard shifts occurred; the vehicle check engine light came on and stayed on while the vehicle went into limp mode. I was able to link to the GMC dealer. The dealer was not and would not inspect the vehicle at that time. I was told I needed to leave or return in two for inspection. The left vehicle was inspected the next day and determined as a value body. The GMC dealer found the part in another state and has the part shipped. I installed the part, had the GMC dealer search it, and performed a recall update.