GMC Complaints

I suddenly lost all power in my pickup. I'd try to accelerate and it would just lag and then all of a sudden it would gain power and take off. It wouldn't shift gears and I could not go over 30 mph, as it was running at about 2-3000 rpm. Once I was in a safe spot to stop, it would not shift into manual or reverse.

Was driving down the interstate at 70mph with cruise control on. The vehicle lunged forward and soon after a reduce power message appeared in the messages. I was able to avoid any incident with other vehicles and exited the highway with the motor was making loud noises. I parked the vehicle and called for roadside assistance. The vehicle had to be towed to the dealer, and I found out that the 6.2 liter V8 motor has metal in the oil and the entire engine needed to be replaced. The thrust bearing failed and required a full engine replacement. The vehicle has approximately 21,000 on it and is still under warranty, but it is a 3-6 month wait to get a replacement engine. I have searched the internet and found that there are many vehicles that are having similar issues with the 6.2 L V8 GM motor. It has been slightly over a month since the incident and have not received any updates.

The contact owns a 2020 GMC Sierra 2500. The contact stated that while driving at various speeds, the steering wheel was pulling to the left unintentionally. Additionally, the contact stated that there was significant play in the steering wheel. The contact stated that while driving 35-40 MPH and driving through a puddle of water, the vehicle veered violently at a 60-degree angle into the left lane while the contact was firmly grabbing the steering wheel, nearly causing a crash. The vehicle was taken to the dealer and was diagnosed with upper steering shaft failure. The contact was informed that the upper steering shaft needed to be replaced. The part was replaced. Additionally, the vehicle was taken to a Tire Shop, where the tires were replaced and alignment was performed. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 31,800.

My car was taken in for service in early January 2025 after just being serviced in November. The engine was making a ticking noise. The check engine light was not on, and appeared to be running fine otherwise so we drove it in for service. We were told upon inspection that the cam and lifters needed replacement, but we pushed for further inspection which found the car needs an entirely new engine, at the advice of multiple inspectors and the service department of two dealerships. Initially, the extended warranty company told us they would replace the entire engine instead of just the cam and lifters. Then they came back and said since we drove it in for repair rather than having it towed, they would not cover it. At the advice of multiple parties, it has been found this engine has so much metal in it, they've never seen anything this bad before. It is impossible it was due to driving it the 5 miles to be serviced. We have requested pictures and documentation about their findings and they are refusing to provide us with them. We have filed a dispute with the insurance company and they are not helping us.

•What component or system failed or malfunctioned, and is it available for inspection upon request? Driver and passenger side rear view mirrors will not hold memory and auto adjust while driving at times. Been to the dealership 5 times. They could not repair and just said that a software update should fix it, but it did not fix it. I will program the mirrors to the preferred settings but when I re-enter the vehicle after shutting it down, it doesn't always retain the memory, and they go to random positions. This usually happens after 5 miles of driving the vehicle. The passenger side mirror will go down so I could see the curbs while in reverse but when I go into Drive, it does not go all the way back up. I will be flying to visit family but the vehicle will be at a different dealership from 3/26/2025 to 4/1/2025. •How was your safety or the safety of others put at risk? After adjusting the mirrors, I left my garage with my kids in the car and started driving to our destination. While entering the highway, I went to check my driver’s side rear view mirror and noticed that it was pointed to a random position. In that moment, I was trying to match the highway speed to enter, there was a vehicle in front of me, a vehicle behind me, and a vehicle on the highway exit/entrance lane that I was trying to be cognizant of location to adjust speed properly. I ended up doing multiple shoulder checks which caused me to lose visibility of the vehicle in front of me multiple times. •Has the problem been reproduced or confirmed by a dealer or independent service center? The dealership says they can not reproduce but I was physically able to show the service writer, he saw it happen. I also asked the dealership to drive it around after reprogramming it, but I don’t think they did drive it because after I bring the car home from the dealership, it starts doing it again. I have a service write up where the service writer says he say it occur. •Has the vehicle or component been in

Engine Failure (Engine Seizure) (Connecting Rod bearing Failure). Enige Failed on an interstate highway causing us to nearly be struck by traffic moving at a high rate of speed. Also, Engine failed on an extremely cold (-17) degree Minnesota Night. This cause extreme concern/anxiety with children in the car as we waited for recovery. Yes, the problem has been confirmed by a GMC dealership in Hudson WI. Yes, the vehicle component has been inspected by both GMC certified technicians as well as 3rd party warranty technicians. Zero warning lamps or messages prior to the failure.

While driving down the highway pulling a trailer the truck started to slow down rapidly. We were able to pull to the side of the road before the truck came to a complete stop on its own. From that point forward, we could not get the truck to move forward even in 4WD. Ended up towing the truck back and a repair shop determined the transmission needed replaced. About 4 months later, we received notice of a recall describing a similar scenario. I submitted the invoice and documentation to GM, but my claim was denied because the codes and symptoms did not match the criteria for the recall.

The contact owned a 2000 GMC Sierra. The contact stated while driving at approximately 70 MPH the driver's side front wheel control arm had fractured and the vehicle went out of control. The contact stated that the vehicle rolled over three times. The contact stated that the vehicle rolled off of the road and stopped on its roof. The contact stated no warning light had illuminated. No air bags had deployed. The contact stated that the police were on scene and wrote a report. The contact was transported to a hospital by ambulance. The contact stated that he was concussed and received multiple lacerations to his head which required stitches. The contact stated he had bruises on both arms and legs and ribs, but no broken bones. The contact stated that he had a passenger who was also transported to the hospital but he was not aware of any injuries. The vehicle was towed to an impound lot. The vehicle was not repairable. The manufacturer was not informed of the failure. The failure mileage was approximately 220,000.

The contact owns a 2017 GMC Acadia. The contact stated that the shift to park message was displayed. The vehicle failed to recognize the gear that transmission was shifted into. The message “Steering Assist Reduced - Drive with Care” was displayed. There was an abnormal beeping sound when the door was closed. The contact had to move the gear shifter to shift into the selected gear. The vehicle was taken to the local dealer, where it was diagnosed that the thermostat and the gear handle needed to be replaced. The vehicle was repaired under the warranty, but the failure recurred. The manufacturer was contacted, and informed the contact to keep the receipt for a possible recall reimbursement and referred the contact to the NHTSA Hotline. The failure mileage was approximately 3,000.

I had my 6.2 engine replaced at 26,000 miles and the transmission rebuilt. The engine was contaminated with metal shavings and the transmission rebuilt for internal defects. The new engine is running fine but the reliability is a concern after reading about other customers having the same problems. My name is [XXX] . The engine replacement and transmission repair was done at Ed Martin GMC in Carmel Indiana. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)