GMC Complaints

6L80 transmission has failed @ 109,000 miles. At a stop light, in drive, vehicle would not move in drive or reverse. After switching back and forth transmission finally started to work and was able to limp to a dealership. Did not realize how big this issue is with this transmission until mine failed prematurely. I thank God that mine happened at a stop light and not when trying to accelerate at a say a stop sign where I need to cross multiple lanes of traffic. I would have been a sitting duck in the middle of oncoming traffic.

Whenever parking the car and trying to stop (shut off) the engine it will randomly say “shift to park” and I cannot shut the vehicle off.

Recall issued in April states that the Engine could experience a catastrophic failure and needs to be inspected for possible replacement. At this time (8-30-25) they are not allowing the dealers to perform these inspections. Why can't they at least perform the inspection to see if in fact the Engine will not need to be replaced? They are being irresponsible with their approach to this issue.

we brought my 2023 gmc yukon into Parks GMC in greenville sc on july 26, 2025 for the engine recall that we received a letter from. We left it as we were going on vacation for the week and picked it up the following saturday august 2nd. the next week my engine light started lighting up and my husband contacted the dealership and we were asked to bring it back in. We did and were told that we now had a bad Telematics Communication Interface Control Module that was causing my engine light to come on and that we were going to have to pay $600.00 out of our pocket to have this repaired. After researching we found that this is a VERY common and widespread problem with a lot of owners right after they bring their vehicles in to be serviced. We declined the repair, one because they did not have the part in stock as that apparently is also a big problem of not being able to get the part in stock and two because we feel like we should not have to pay to have this part replaced as it appears to be a widespread issue that is happening. The dealership also charged me $182 for diagnostic charges that I once again feel like we should not have had ton pay. Please advise us asap. our contact info is [XXX] [XXX] & [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While super cruise was engaged the car changed lanes automatically without any action on my part. The problem is I had set the automatic lane change feature to only activate when the turn signal was switched. While examining the vehicle settings I discovered that the feature was set to automatic not turn signal activated. What cause the software to change this setting? The service tech could not find any problem but guessed that when the software is updated it goes to a default setting. This is wrong. Setting should not change. The setting also changed on opening the tail gate with my foot. This setting was turned off.

EPS becomes difficult to steer occasionally, Brakes seem to lose stopping ability Leaking oil @ either oil pan or transmission

I was read ended at a stop light. The other drive fell asleep. She was in a 3.25 ton dodge ram going 45-55 mph. She never touched her brakes. She pushed me into the car in front of me. Air bags never deployed . My car is totaled. The driver’s car hit so hard the front of her car was in my third row of seats. I was taken to the hospital for chest pains since the seatbelt was the only thing that saved me .

Have owned my 2021 GMC Sierra 1500 with the 3.0 Duramax for a year and the check engine light has come on multiple times for a "Coolant Control Valve" issue. The truck runs the fans at 100% and puts the truck into reduced power at least once a day. I have read that GM sometimes will not cover this repair under powertrain warranty even though it's an engine problem. Please fix this issue! To answer the previous questions, the coolant control valve is malfunctioning, and the truck is currently at the dealer being inspected. Yes the dealer has said this issue is common on these trucks (confirmed by National GMC in American Fork, Utah). Yes the check engine light has appeared multiple times. These issues started appearing in June 2025

The contact's grandmother owned a 2015 GMC Canyon. The contact stated that her grandfather was driving approximately 60 MPH on the freeway while her grandmother was occupying the front passenger's side seat. The contact stated that while the driver was attempting to switch to the right lane, the steering wheel locked up and the vehicle shut off unexpectedly. The driver was unable to pull to the side of the road and turned on the hazard lights. The contact stated that another van driving 80 MPH crashed into the vehicle, and the van caught on fire; however, the vehicle of the contact's grandparents did not catch on fire. The vehicle was then rear-ended by three other vehicles, causing the bed of the vehicle to be smooshed into the cab, and the driver's side of the vehicle was smooshed into the center divider wall. The center divider wall might have been damaged. The driver sustained whiplash and was thrown across his wife's lap. The emergency services assisted the driver out of the vehicle and put the driver on a stretcher. The contact's grandmother was assisted out of the vehicle. The contact stated that only the driver's side and passenger's side curtain air bags deployed. The driver was transported to the hospital by emergency services. The contact stated that the driver sustained a crushed spine and severed lower nerves, causing the lower body paralysis. Additionally, the driver sustained broken ribs, 15-20 staples across his head, ruptured lungs, which caused a loss of 7 pints of blood. The driver received a transfusion of 5 pints of blood. The driver's wife sustained a bruised right cheekbone, soreness on the face, the hand, the thumb, and the body. Both passengers were currently receiving medical assistance. It was unknown whether the other drivers sustained injuries. A police report was filed, and the police confirmed that four vehicles had crashed into the vehicle. The police report information was not available. The vehicle was towed to a tow lot, where it was totaled. The dealer and the manufacturer

The driver-side headlight and turn signal on my 2022 GMC Yukon stopped functioning completely. This issue began before GM recall 22V-903 and worsened immediately after the recall repair was performed. The recall repair required three separate dealership visits because it was initially performed improperly, yet the problem was never fully resolved. During interactions with GM and the dealership, I was told the repair might involve a $600 part, but they could not guarantee that replacing it would fix the issue. It is unreasonable and unsafe for me to be expected to cover the cost of repairs for a problem that was caused or worsened by a recall repair performed incorrectly. The malfunction creates a serious safety hazard, as oncoming drivers cannot see my turn signals, and I nearly had an accident because of it. The problem has been confirmed by the dealership and documented in GM Case #74327012. Prior to complete failure, the driver-side turn signal and daytime running lights occasionally stayed on after shutting off the vehicle which I was told that was caused by the recall. The vehicle has been inspected by authorized GM dealerships multiple times, but the defect persists. The component is available for inspection upon request.