GMC Complaints

I was 450 miles away from home. Travelling at 80 mph in the left lane of Interstate 35 when the Yukon stopped accelerating and started coasting. I looked at the gauge clusters on the dash and it said Press Start to Shift. I looked at the shifter and it had automatically moved from Drive to Neutral. It would not move back to Drive. I then pressed the Start button like it said on the dash and the whole vehicle shutoff while still at highway speed going 70mph and still coasting. I put hazards on and moved to the right sliding in-between two 18 wheelers who gave me space thankfully then I was able to get it to the shoulder. Once stopped I moved it into Park and pressed the Start button and the dash said "unsafe conditions unable to shift", or something like that. After 2 minutes of pressing the Start button, I was able to get it started again and we started back on the road. After 2 miles, I was once again back to 80 mph in the left lane when it happened again. This time I was barely able to move off the road. We were on a long turn to the left and several 18 wheelers were all around. Once stopped, it never started again. The engine shutting off at highway speed with 18 wheelers all around put myself and 2 family members at serious risk for injury and we were just leaving a family funeral. And the 2nd time it happened, I was not able to fully pull over either causing 18 wheelers to come very close to hitting us as we were stuck on a left hand turn with a 60 mph left to right cross wind making it very dangerous for us while we waited 80 minutes for a tow truck. The only indication of a problem was the engine light on after we were stopped nothing before hand. no sound, no warning, no vibration, just an immediate shutdown. The dealership it was towed too said it is a complete engine failure and the bearings more than likely failed and I will have to wait for a new engine. Most likely the same faulty 6.2 engine. Please do something before someone dies.

Truck has had multiple "service emmision system" errors which can leave the driver stranded and left in traffic as the truck goes into limp mode and won't maintain speed with traffic flow. There are electrical glitches and issues with the circuits and heating elements themselves and in the pump... as soon as there is an error in the system... which has happened 3 times now in 104k miles (~80, 103k and 104k)... the truck is rendered useless and stuck in traffic. Emmisions system needs to be covered for the life of the vehicle if it is going to have non stop issues.

Vehicle lurches forward extremely strong when almost stopped, shifting from 2nd to 1st. Common issue with all of these trucks with the 8L80 transmission. Also - this transmission slams into 2nd from 1st when first starting out under light acelleration or drifting down hill.

Shift to park msg appears randomly causing the car to not completely turn off even though car is in park. Have to turn car back on and shift to drive back to park couple of times before msg goes away. I see so many people with the same problem why isn't there a recall this is a safety issue. The 1st time my warranty covered the repairs , 2nd time around I have to pay of pocket.

In the fall of 2023 my 6.2L V8 with only 107,565 well maintained Miles completely seized up and shut off without any warning lights or other indications of failure. I was going up a steep hill and luckily I was able to get to the side of the road by coasting backwards to a stop and fortunately no one else behind me at the time. I did not get my truck back until late spring of 2024. I paid over $13k out of pocket to replace the engine because of this issue that is known to many other GM truck owners. Prior to catastrophic engine failure I’ve had multiple services including replacement of torque converters which would cause the truck to shake violently when shifting along with violent shifts in the 8 speed transmission and at times the feeling of being rear ended when slowing down or coming to a stop which GM claims to be “normal operation”. The engine failure was never investigated by any other parties but was looked at by the dealership service department. Both violent shifts and torque converter shutter were also confirmed by the dealer but only fixed with what I consider to be temporary remedies.

The engine had a bearing fail causing the engine to knock and make loud noises. The engine has been replaced and is at GMC corporate investigation center. GMC installed another engine that is also doing the same thing 150 miles after it was replaced. My families safety was put at risk because the motor could have locked up or exploded with us in the car causing a crash or possible fatality. Yes the problem was found at the dealer and caused them to investigate which is when they found the failing bearing. Yes, GMC corporation has the failed components and identified the engine needs replaced. They have yet to comment on the second engine that needs replaced. There are no warning lights to identify this issue, The lack of notification from GMC could cause drivers to be hurt by not knowing their car is failing.

The contact owns a 2022 GMC Sierra 1500. The contact stated that while her husband was driving 30-35 MPH, the vehicle stalled. No warning lights were illuminated. The contact's husband was able to pull over onto the side of the road. The contact's husband attempted to restart the vehicle, and the vehicle failed to restart. The vehicle was towed to the dealer where it was diagnosed and determined that the engine had seized and needed to be replaced. The contact's husband stated that the tow truck driver could not move the gear shifter into neutral(N) when the vehicle was being towed. The vehicle was not repaired. The manufacturer was notified of the failure. The vehicle remained at the dealer and had not been driven since. The failure mileage was 81,000.

The contact owns a 2020 GMC Terrain. The contact stated that while driving at slow speeds in a parking area and attempting to stop, the brake pedal failed to depress all the way to the floorboard and was firm, requiring an increased effort; however, the vehicle failed to stop as intended. The contact was able to bring the vehicle to a complete stop by turning the vehicle off. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the brake vacuum pump, observing that the pump had sent metal fragments into the engine, resulting in damages to the engine. The vehicle was not repaired. After investigating the failure, the contact related the failure to Special Coverage Adjustment: N182202780. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 108,000. The VIN was not available.

Engine failed and had to be replaced. GMC was absolutely no help had to bring to local gas station where i had to pay almost $12,000 to get it fixed. The truck has been in shop frequently for oil issues with this motor but GMC just jerks you around. I am in sales and need my vehicle to support my family

Driving on a highway at 70 MPH then vehicle shut off / lost all power (with my kids in the car!!). Luckily we made it across three lanes of traffic to the shoulder. Got the vehicle to the dealership where they said they found large amounts of metal shavings in my engine. The engine was replaced but I am still nervous when office that it could happen again. I’m in a Facebook group where people are continually reporting the same thing happening to them. I bought this large vehicle to transport my kids and this is an extreme safety hazard (not only for us but those driving around us). This happened when I only had approximately 18,000 miles on the vehicle. Pretty much still brand new. Since then, I recently had to have the belt replaced again and the rear differentials flushed for loud grinding noises.