GMC Complaints

On August 9th at 5:30PM roughly, while attempting to park using the vehicle’s Park Assist feature, the system failed to function properly—specifically, it failed to detect a pole at the rear of a parking space, did not slow or brake the vehicle, and was not even aware it would contact the pole. It then collided with the pole. Also, intermittently the forward collision alert system either does not alert for similar circumstances as it just previously did. Seem untrustworthy. Scary. GM's product allegation team (PAC) had all of the necessary information to show the system does not work 100% of the time (I have it all on video and submitted that) and they denied my claim and refused to admit a system failure even when given the videos showing the park assist failing to engage properly ON VIDEO.

My 2013 GMC Terrain suddenly began to jerk as I was heading to run an errand in town. I pulled my truck back in the drive way at [XXX] where it is parked now. I had a mechanic to come and tell me the engine will need to be replaced and an estimate of the cost to repair it. I could have been rear ended by another vehicle since this suddenly occurred with no prior warning which could result in my death. I have contacted GMC due to a recall on the engine. GMC is declining to honor my request repair my vehicle based on the estimate I provided. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The vehicle’s frame has severely rusted to the point of structural compromise. My certified mechanic determined on December 10, 2024, that the frame could not pass the state safety inspection due to advanced corrosion. Welding is now required to restore structural integrity. The truck has remained inoperable and sidelined since that date. The frame is available for inspection upon request, and I have photos, repair invoices, and a mechanic’s written evaluation. This same frame was previously reworked by GMC twice: May 7, 2018 – Frame treated for premature rust. November 4, 2019 – Frame recoated after prior treatment failed due to improper descaling. Despite these reworks under GMC direction, the issue has progressed to a dangerous level. The structural integrity of the frame is compromised. A severely rusted frame puts occupants and others on the road at risk in the event of a collision, towing, or even regular driving. A weakened frame could lead to loss of vehicle control, failure to protect occupants in a crash, or catastrophic breakage of suspension or driveline components while in motion. Yes. The problem has been confirmed by an independent certified mechanic, who inspected the frame and advised that the rust is beyond surface level and requires welding to repair. They refused to weld during winter due to safety concerns and advised that the truck could not be driven or pass inspection in its current state. The vehicle was previously serviced under GMC’s direction in 2018 and 2019 by a GMC dealer (Weird GMC) to address early frame corrosion. However, the current failure has not yet been inspected by GMC directly since becoming undriveable in late 2024. I have reached out to GMC Customer Assistance and am awaiting a response. There were no dashboard warning lights or alerts for this issue. The only indications were visible signs of rust, which rapidly worsened after the 2019 rework. My mechanic noted signs of significant corrosion during routine servicing

The contact owns a 2018 GMC Acadia. The contact stated that while attempting to turn off the vehicle, the "Shift to Park" message was displayed, preventing the vehicle from turning off. After researching the failure, the contact linked the failure to NHTSA Campaign Number: 23V172000 (Power Train). The local dealer was contacted and informed the contact that a diagnostic test was needed. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 60,000.

The 2021 GMC Sierra 1500 has an Electronic Parking Brake (EPB) that bolts on to the rear calipers. The EPB does not release, in order for service, you have to long press the parking brake, then the truck goes into service mode & will release the brakes for service, some newer models may not have this feature. The vehicle has 36,000 miles on it & the inside rear brake rotors are worn down from the EPB dragging & not releasing as supposed to, causing excessive premature wear & that could cause a safety hazard fleet wide. The EPB should not be in use while the vehicle is moving, but it is coded to not release, meaning whenever you press the brake it never moves back out away from the rotor, causing drag & or even can cause warping of the rotor. I do not understand the thought process in regards to not letting the EPB release, it acts like the screw type caliper that would have the same issues of every time it moves out it will not go in until taken apart & screwed in, again meaning the brake pad is constantly dragging on the rotor which could in turn also affect the miles per gallon. I see the thought process to use EPB as useful but not a good execution by the manufacturer.

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated and the vehicle started running abnormally rough, promptly the contact to discontinue driving the vehicle. The message “Service Traction Control” was displayed, and the ABS warning light was illuminated. The vehicle was taken to the dealer, but it had not yet been diagnosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 20,000.

The contact owns a 2021 GMC Terrain. The contact stated that the transmission was previously replaced. The contact stated that upon starting the vehicle, the check engine warning light illuminated. The failure had occurred intermittently. Additionally, the contact stated that while driving approximately 15-20 MPH and depressing the accelerator pedal, the vehicle failed to respond for approximately 1 minute. The vehicle was taken to the Nissan dealer it was purchased several times. The dealer retrieved diagnostic trouble codes: P057C and P057E, and the brake pedal position sensor was replaced twice; however, the failure persisted. The Nissan dealer took the vehicle to a GM dealer, where the cause of the failure could not be determined. The vehicle was not repaired. The contact related the failure to TSB Number: PIT5994 (Diagnostic Tip for Reduced or Low Engine Power on Acceleration). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 78,843.

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure.

The contact owns a 2018 GMC Acadia. The contact stated that while shifted into park(P), the vehicle was unable to be turned off. The message "Shift to Park" was displayed on the instrument panel even though the gear shifter was in park(P). The gear shifter was shifted to park(P) and wiggled several times before the transmission was properly shifted into park and the vehicle was turned off. The contact stated that the failure had occurred once before, and the battery cables were disconnected to turn off the vehicle. The contact became aware of an undisclosed recall online; however, the VIN was not under recall. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 51,800.

The contact owns a 2022 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). However, the part to do the recall repair was not yet available. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The contact was able to pull over to the side of the road. The contact turned off the vehicle, and the vehicle failed to restart. The vehicle was towed to the dealer; however, no cause for the failure was found. The vehicle was then towed to an independent mechanic who diagnosed that the engine and computer chips had failed. The vehicle was repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The failure mileage was 56,313.