GMC Complaints

The contact owns a 2021 GMC Terrain. The contact stated that while driving at various speeds, the vehicle hesitated while depressing the accelerator pedal, with a misfire coming from the engine. During the failure, the message "Engine Power Reduced" was displayed on the instrument panel. The vehicle was taken to a local dealer, and the contact was provided an estimate for a diagnostic test. The contact declined. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was unknown.

Vehicle has 28,000 miles and auto shop states that the engine is blow, it's knocking and vibrating throughout the engine.

Odometer Fraud. The contact attempted to purchase a 2020 GMC Sierra 1500. The contact discovered a mileage discrepancy. The vehicle was a private sale. At the time of purchase, the mileage was 75,000. At the time of registration, the Carfax Report indicated that the mileage was 175,000.

The engine decided to make some noise and all I heard was Ching Ching Ching, and it just died and I was unable to start it again

The vehicle went into low power mode and said to pull over. As soon as that message appeared the next warning appeared and said to shift to neutral and pull over immediately and attempt to restart. The vehicle immediately shut off after second warning before having time to pull over from first message. I was able to pull most of the way off the road as the vehicle had shut off there was no power steering and had limited ability to steer the vehicle. This all happened without advance warning or any other warning that there was an issue while traveling at over 75mph. Vehicle would not restart and needed to be towed. Dealer stated it was a fule control module that was hard to get due to a recall. But that my vehicle was not part of that recall.

Vehicle could not detect key fob, key fob had normal operation(lock, unlock, remote start, tailgate open and close, all functional) but unable to start vehicle or power vehicle accessories. Windows opened with key fob and could not close windows, could not put vehicle in neutral, was stranded for 6 hours, unable to scan vehicle due to lack of key detection not allowing accessories to operate to attain connection with modules, unable to tow because couldn’t get vehicle in neutral. Vehicle battery good, key fob battery good. Was stuck with vehicle because couldn’t not close windows. Very unsafe and inconvenient situation.

I was pulling out of my driveway when I noticed that my mailbox was blown open from a recent storm. I stopped and put it in reverse (well tried to) but the vehicle would not shift. Quickly I continued to drive to make a u-turn instead and at that point my vehicle would not drive normally. The rpms would not go up despite pressing the gas and the engine was reving very high.gm dealer said $700 to pull the transmission to determine the issue, but after my research I’m certain it’s the valve failure in the transmission just as it’s done the same to others. Why is this transmission not recalled, but the disel engines on the same model are? Seems as though it is a similar issue. I’m afraid to see what they will charge me as my vehicle has 76,000 miles and I’m told is outside warranty coverage.

Oil cooler blew and mixed oil in coolant reservoir. Possibly causes overheating and engine seizure. This has been confirmed with a certified GM service center. The service center inspected fixed it then within 5 miles had to be returned to the dealer because it happened again.

Traveling on I-10 doing approx 75 mph head a loud boom and saw sparks coming from the read drivers side of the truck. Truck was riding a bit low on that side. Pulled over and determined the tire had blown up. Currently doing the insurance claim and repair as there was substantial damage to the truck. No crash or involvement by other motorists. Did not hit anything.

I just survived a terrifying incident that proves the current GM 6.2L (L87) engine "recall fix" is a dangerous myth. Living with the "Ticking Time Bomb" I bought my 2023 GMC Yukon AT4 brand new, but for the last two years, I haven't truly "owned" it—it has owned me. Every long-distance trip with my family was filled with anxiety. I constantly worried that I’d be the next one stranded on the side of the road while my neighbors' and friends' 6.2L engines were seizing all around me. I traveled with fear that I’d be coming home in a rental car. The False Security of the Recall When the recall finally arrived, I thought the nightmare was over. On Sept 15, 2025, my dealer in Newburgh, NY, inspected the truck at 48,000 miles. They told me my engine "passed," switched the oil to 0W-40, and issued me a 150,000-mile extended warranty. I realized then what I know for sure now: 0W-40 oil is a band-aid, not a cure. GM used thicker oil to "cushion" a physical manufacturing defect in the crankshaft and bearings just to avoid the multi-billion dollar cost of engine replacements. They traded my family’s safety for their bottom line. The Catastrophic Failure Last Friday, March 13, 2026, the "fix" failed. I was traveling 70 mph uphill on I-84 with my **newborn baby** and two other kids in the back. Without warning, the engine seized solid. I lost all propulsion in heavy traffic and had to fight to get my children to the shoulder. We sat in the freezing cold for over an hour while traffic flew by us. An extended warranty is worthless when your engine dies in a high-speed traffic lane with an infant in the car.