GMC Complaints

The dealer claims it was a faulty battery. Said it had a short in it. I have the battery and it can be inspected. I firmly believe it was software related. I was driving and the vehicle completely shut off while driving. I was unable to steer, restart, use the power assisted brakes, or navigate to a safe area. I was unable to restart the vehicle and it had to be towed. The problem was never reproduced and has not occurred again. The vehicle was inspected by the dealer. All possible warning lights came on the dash and display. The radio and Bluetooth still worked.

The servicing dealer identified a faulty injector wiring harness. A national backorder caused a delay in repair. I do not have the part. The dealer retained. I was driving at highway speeds on the interstate and every possible warning light came on the dash. "Service ESC" "Service Traction Control", Reduced Acceleration Drive with Care", "Forward Collision System Unavailable", "Service Emmision System" At this point, I experienced a loss of power and acceleration, and the vehicle would shake violently when I applied the accelerator pedal. There was no indication of any failure prior to the failure.

We purchased our 2024 GMC Terrain on April 13, 2024 and on June 12, 2024 my husband and I were headed out to go to dinner and when leaving our neighborhood I noticed a weird transmission shift or slip and then the vehicle rpms increased suddenly. I pulled off the road and put the vehicle in park then I attempted to put the vehicle in reverse. The reverse lit up and just began to blink in the dash but the transmission did not go into reverse. I was able to put the vehicle in park and then drive to return home (we were less than 1/4 mile from home thankfully). Luckily we live in rural area and there were not many people on the road. Had we been on a busy road this could have been a dangerous situation. The next day the car was towed to the nearest GMC dealership. The original diagnosis was that the TCM was bad and needed to be replace and that there would be an estimated wait time of about 7 weeks. The TCM was replaced but did not resolve the issue. At that point (July 30, 2024) GM released a bulletin regarding a bad snap ring condition. The service dealer torn down the transmission and determined the snap ring was bad and they also noticed that the clutch was severely burned and needed to be replaced along with both valve bodies. By the time the parts came in and these repairs were completed, we were without the vehicle for 12 weeks. The vehicle was returned to us on 8/21/24. Unfortunately on 8/26/24 - 5 days and approximately 196 miles later, the vehicle began to behave the same way and had to be returned to the dealer. At this point we requested that GM buy the vehicle back from us which they very promptly declined. The transmission was completely tore down again and it was determined a seal or ring needed to be replaced. That repair has not worked either. Now more than 2 more weeks have passed and we are now waiting on a complete new transmission. We have again requested GM but the vehicle back from us. We are waiting on their response.

Driving in my newer GM Yukon Ultimate at 13k miles on the freeway. Vehicle with no warning shuts down while going 60mph in the middle lane. Was able to safely steer the car to the side of the road to avoid a collision. Vehicle lost all electrical contact. could not shift into neutral to tow. Turns out vehicle engine had to be replaced. GM approved a new engine replacement and are planning to return the vehicle back to put on the road. The vehicle is unsafe, at 5k miles, 6 months prior, the vehicle had to have the steering system replaced due to failure as well. Online research shows that others are having the same issue with failed engines on these GM vehicles and models.

The vehicle, since it's purchase, has a persistant flickering occuring with the entire headlight when the main headlights are on. The problem doesn't seem to be an issue when the DRLs are only being used. The vehicle was taken back to the dealership to be looked at but when they discussed the issue with the GM even they couldn't figure it out. This can pose a serious safety issue if the lights go out all together at night on a dark roadway.

The check engine light came on 12/2023. The vehicle was taken to Pep Boys and AutoZone in MD, WalMart and O'Rilley in Bastrop, LA, O'Rilley in Midlothian, TX. They could not find any problems with the vehicle. I took the vehicle to GMC in Plano, TX. THey charged me for a new battery but the check engine light remained on after I picked up the vehicle with a newly installed battery. The dealership said it would eventually go off. I took the car to Automotive Solutions in September 2024 and they can not find anything wrong with the vehicle. The car can not pass Texas inspection with a check engine light on. There is a large group on FB having this same problem. August 2024 the car will recognize when it is shifted into park. Sometimes it rolls after puting the car in park.I took the car to Automotive Soulutions in September 2024 and they can not find anything wrong with the vehicle. There is a large group on FB having this same problem. I took the car into a GMC dealership in MA because i hit a curb in 2021. The steering wheel feels loose. I took the car in 2022 & 2023 for the same problem. The dealership charges me for repairs but there is a reoccurring steering problem. Other drivers have noticed this problem with my vehicle.

HEAD LIGHTS FLASH 2-3 Times a minute and getting worst safety concern others driver pulling over thinking I'm the police, had a truck pull out in fount om me assuming i was flashing him to come out, came close to losing my life ,I'm afraid it going to cause road rage called dealer three day after purchase drop it off they inspected and called gm known issue doc #PIT6203A ,no current fix for issue i was told to keep paper in truck in case i get pulled over by police for flashing light s hopefully you wont get ticket the date 8- 19-2024

The contact owns a 2017 GMC Acadia. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted, with the shift to park message was displayed. The contact attempted to restart the vehicle, but the vehicle failed to shut off when the contact attempted to engage the parking brake. The contact forcefully engaged the parking brake to shut off the vehicle. The vehicle was taken to the dealer where it was determined that the transmission failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The failure mileage was approximately 13,000.

The contact's husband owns a 2021 GMC Sierra 1500. The contact stated that while her husband was driving 80 MPH, the vehicle stalled. Additionally, the "Shift to Neutral and Restart" message blinked. The vehicle was steered to the side of the road where the vehicle failed to restart. The vehicle was towed to an independent mechanic where the failure was not able to be replicated. The vehicle was then towed to the dealer where it was suspected that the crankshaft bearing had seized, putting pressure on the starter, causing a short. The contact was informed that the engine needed to be taken apart for a proper diagnostic test. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 81,000.

After roughly 7000 miles of use the 235/55R20 102V Goodyear Assurance Weatherready tire has a bulge in the sidewall. There are no scuffs or scars on the tire to indicate an impact caused the bulge, it appears there is some sort of separation within the layers of the sidewall. I asked a Goodyear retailer to inspect the tire and they said it's automatically considered impact damage if the bulge is in the sidewall and Goodyear would not warrant such damage even though there is no evidence such as cuts, scuffs or scars. The tire inflation is to manufacturer's specifications and the tire isn't loosing pressure. DOT 1M78AJA5R purchased Oct 22, 2023 date code 3622