GMC Complaints

Recently experience rear differential binding with vehicle resulting in an accident.

Engine timing chains failed at 71,000 miles requiring a $9,700 repair. Warranty covers 5 yr/ 100k miles and was not fully covered by GM since the vehicle was 9 months beyond 5 years, yet still well within the 100k miles. Issue was diagnosed via P0016-00 being set indicating misalignment between crankshaft position sensor and the intake camshaft position sensor. This issue is a known problem with the early LM2 engines, and the timing chain was upgraded in later LM2 engines. Early adopters of the LM2 are left to pay the price for a defective part.

The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, there was an abnormal bumping sensation coming from the accelerator pedal. Additionally, the contact stated that there was an abnormal bumping sensation while turning the steering wheel. The contact stated that the failure had occurred while driving at slow speeds. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact stated that the vehicle was scheduled for a diagnostic test. The contact referenced an unknown recall, with a similar failure; however, the VIN was not under recall. The manufacturer was made aware of the failure, and a case was filed. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 62,500.

In the past few months this truck has been worked on twice. First was the valve body and now it is the coolant control valve. These things have caused my truck to completely slow down or shut down without warning.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 25-30 MPH, the power steering became inoperable. The check engine warning light was illuminated due to the fuel tank cap being missing. The contact stated that the failure was related to NHTSA Campaign Number: 14V246000 (Steering). The vehicle was taken to the local dealer, where it was diagnosed with a short in the steering gear. The vehicle was not repaired. The manufacturer was contacted and confirmed that the VIN was not under recall. The failure mileage was approximately 130,000.

- On 9/23/2025 while driving down the main street, the vehicle unexpectedly shut down (engine stopped running) and would not restart. The vehicle is currently at Elevation GMC (Boone ,NC) waiting to be diagnosed. - Safety was put at risk by the vehicle unexpectedly shutting down in the middle the of rush hour traffic and not being able to be moved. - When it is was towed into the dealership and explained to the service manager what happened; she said "there is a known problem with the gear select lever losing communication with the truck and not knowing what gear it is in". - As of 9/24/2025; dealership has not looked diagnosed what the problem is/was. - There were no prior warning messages before the engine shut down.

Shifting to park and vehicle stating the vehicle is not in park, won't let me turn the vehicle off. Transmission going out, brought to many shops letting me know that the transmission is not working properly but won't give an engine light if anything is wrong with vehicle, Wont show on readers what is wrong with vehicle. Electrical, Doors will automatically lock and unlock most times lock and locks me in the vehicle having me have to climb through the windows and having to leave my windows open or locks me out the vehicle and can only get in by climbing in the trunk. Testing has been done and brought to GM to figure out the issue, and they replace the computer in it but still has the problem. I have had shops tell me these are all huge issues that needs to have a recall because my vehicle is not the only GMC Acadia that does all this. How is any of this safe for me and my kids.

While driving back home on the highway (I-95) on February 26, 2025, my truck stopped accelerating right in the middle of the highway and cut off. Tried to crank it back up to no avail. I had it towed to the nearest GMC dealer which is GMC Coral Springs. They did an inspection and immediately communicated that the fuel pump module had failed and needed to be replaced. The only option at the time was to just have it fixed because I was out of warranty. At the time, I had about 100k miles on it and the guy at the dealer told me that he's supriesed it lasted that long as those modules usually go out before 100k mile. I got it fix and on March 1, 2025, the truck was ready for pickup. Fast forwarding, now GMC is recalling the 2021 Yukon with recall N252516900 for the same EXACT issue. I spoke to GMC corporate this morning to see if I can be reimbursed for the cost. When the rep Tina ran my vin, she states my vin wasn't attached to the recall number. So I was trying to understand that the issues are the same, why can't they reimburse me. Same issue on the same year truck. GMC refused to help me. I'm so disappointed because I'm not even sure why my truck wasn't included in the recall but has the same issue. I need your help. Please and thank you. (I contacted the dealer to have the email me a copy of my invoice for the service at the time, however I haven't received it. I will contact them again to see if they can email it again. But I will obtain a copy of it even if I have to drive out ther)

[XXX] [XXX] Phone: [XXX] Email: [XXX] [Date] National Highway Traffic Safety Administration Office of Defects Investigation (ODI) 1200 New Jersey Avenue, SE Washington, D.C. 20590 Subject: Safety Complaint Regarding 2020 GMC Yukon XL Denali – Repeated Engine Failures (VIN: [XXX] ) To Whom It May Concern: I am writing to formally file a safety complaint regarding my 2020 GMC Yukon XL Denali (VIN: [XXX] ) which I purchased in 2021. This vehicle has experienced repeated and dangerous mechanical failures that raise significant safety concerns. •March 2024: The oil pump failed, resulting in immediate engine issues. Repairs were completed under warranty, but the check engine light remained on afterward. •April 2024: The vehicle broke down again. At that time, the cams and lifters were replaced in addition to other service, but the underlying issues were not resolved. •August 2025: The vehicle failed once again. After taking it in, the service department could not determine the cause. When they believed they had identified the issue and took it for a test drive, the vehicle broke down again and had to be towed back to the shop. At that point, I was informed that the vehicle now requires a complete motor replacement and a new fuel pump. Each of these failures has left me stranded and placed me and my family in unsafe situations on the road. Despite contacting the dealership (Joseph Cadillac of Dublin), General Motors, and the warranty company, none have taken responsibility to properly resolve the issues. I believe this represents a potential defect in the engine or related systems that could impact many other consumers. I respectfully request that the NHTSA investigate this matter to determine whether a broader safety recall or manufacturer action is warranted. Thank you for your attention to this matter and for helping ensure consumer safety. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Transmission shifting - faulty shifting between 25 - 55 mph. Took truck to dealership and they state that the radiator leaked coolant into the transmission. They are replacing the transmission and radiator under warranty. Truck only has 21K miles on it. Mostly all highway.