GMC Complaints

Since delivery, my 2025 GMC Acadia AT4 has had severe wind noise from the driver's side window at highway speeds. The noise sounds like fingernails on a chalkboard and at times as though the window may shatter. I have taken it to the dealership 4 times with no resolution. I provided video clearly capturing the noise and was still told they could not hear it. I have confirmed the dealer road tests the vehicle in morning traffic at low speeds — where the noise cannot occur. It only happens at highway speeds. Their "cannot duplicate" finding is the result of inadequate testing, not the absence of a defect. After sitting for approximately 7 days, condensation builds up inside the cabin, indicating the driver's side window seal is improperly installed. I reported this to the dealer as well with no fix. After 4 visits, dismissed video evidence, and improper test procedures, the defect remains unrepaired. I request NHTSA investigate this as a potential widespread issue on 2025 GMC Acadia vehicles.

The contact owns a 2026 GMC Sierra 1500. The contact stated that while her husband was driving approximately 10 MPH, the vehicle unexpectedly shut off and independently shifted into park(P). The contact stated that previously, while the vehicle was idling in a parking lot, with air conditioner activated, the Auto START/STOP feature engaged, and the vehicle shut off. The message “Service Transmission” was displayed. The vehicle was taken to a local dealer and was diagnosed with transmission failure. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 2,000.

For the past 6 months I’ve had issues with my crash avoidance system, steer assist and lane departure warning. The crash indicator light would illuminate on my dash for no apparent reason. That would disable my crash warning system, steer assist and lane departure warning but, I could still adjust my distance for my brake warning indicator. The other problems that are not safety related is cruise control and automatic high beam lights will not function. I researched the Internet and found this is not an uncommon problem for this year model. The most common fix (if the windshield is not dirty) was remove the F 11 fuse, in the fuse panel beside passenger door for 10 seconds, that would allow the system to reboot. That worked for 3 months with more than 10 occurrences of the light illuminating on the dash. Now the crash indicator light is on continuously and will not reset by removing the fuse. The computer is up-to-date and all the settings in the infotainment system for the crash avoidance system are activated. Check numerous Internet websites, the cameras for this system is on backorder. So there must be a parent problem with the system. I was required to purchase 36 months of OnStar, I did not purchase a renewal agreement after the 36 month and this issue started soon after.

THE FRONT PASSENGER SIDE SEAT BELT RETRACTOR IS FAILING TO RETRACT. I HAD A PASSENGER IN THE VEHICLE AND AS WE CAME TO A STOP IN MY DRIVEWAY TO EXIT THE VEHICLE SHE UNHOOKED (RELEASED) THE SEATBELT AND IT WILL NOT RETRACT. THE SEATBELT IS NOW CURRENTLY EXTENDED OUT AND WILL NOT RETRACT BACK INTO THE RETRACTOR. I PURCHASED THE VEHICLE TODAY 08-05-2026, I CALLED THE DEALER I PURCHASED IT FROM AND THEY STATE THAT THERE IS NO RECALL ON THE VEHICLE WITH THIS ISSUE. I DID LOOK THE ISSUE UP ON GOOGLE AND INFACT IS STATES A PROBLEM WITH THE SEATBELT RETRACTOR FOR MY VEHICLE. I SENT THEM A SCREENSHOT OF THE CONFIRMATION FOUND AND THEY DECLINE TO ACKNOWLEDGE A REPAIR STATING THERE IS NO RECALL. I WAS ABLE TO MANUALLY FEED THE BELT BACK INTO THE RETRACTOR, IT WAS EXTREMELY DIFFICULT BUT I SAT IN THE SEAT TO DUPLICATE THE ISSUE AND IT WILL DUPLICATE. THE SEATBELT IS CURRENTLY EXTENDED AND WILL NOT RETRACT AUTOMATICALLY. THE SHOULDER STAP WILL NOT FIT SECURELY AROUND A PASSENGER AT THIS TIME. I HAVE HAD NO PRIOR USE OF THE VEHICLE UNTIL TODAY AS I PURCHASED IT FROM A REPUTABLE DEALER WHO STATES THEY DID A FULL INSPECTION OF IT PRIOR TO SELLING BUT APPARENTLY THIS ISSUE WAS NOT REPAIRED PRIOR TO SELLING IT.

My grill deflector suddenly flew off, hit my windshield a flew into a semi hauling oil field equipment. We both pulled over and found no significant damage to his truck. I have a two inch scratch on my windshield and possibly lite hood scratching. Dealership required me to pay $390.73 but said I would be reimbursed for my losses. It never happened. Now I’m fighting with GM to get some resolution. This could be deadly for a motorcycle rider for sure. Hundreds of people reporting same issue on 22 and 23 Sierras and AT4’s.

Because of the intentional failure of GMC and there promise of “We are Professional Grade”, I almost got plowed down by a semi when the car began to quit on the highway going 60. After pulling into the next driveway, which happened to be a Parker’s Kitchen, and ending up on the curb spot, thanking God I wasn’t dead, I sat there for a moment wondering what just happened. As I went to restart the car, it wasn’t having any of it. 40,000 miles, not professional grade GMC, circus grade. Towed it to my home, figuring it has to be something minor and a diy fix. Bought the hyper-tough code reader delivered by Walmart and it delivered professional grade results: U18A2, P1787 and P187E. I am beyond pissed. I could have died due to your intentional negligence in manufacturing. I have a car that will not start, with payments. I have searched the internet and found your “save ourselves plan” and let’s do a voluntary recall starting with 2021 on the same failed parts I am dealing with at the moment. Thanks GMC, who is the ringleader of your circus?

adaptive cruise disengaging alert on dash- no cars or weather conditions to induce this. loss of power and bucking on highway( near accident caused) catostostrophic sudden loss of power engine/transmission failure while mechanic driving resulting in car towed back to dealer. loss of power multiple times causing near accidents. sudden jolting at stop light causing car to propel forward requiered both feet on brake pedal to stop. 4 episodes of near collision 1st altert started 04/4/2024 adaptive cruise light on dash 14,700 miles on vehicle 5 episodes continued and now car is still at dealership for emissions failure, loss of power x 4 weeks. ALL PHOTOS OF DASH LIGHTS, REPAIR INVOICES AND VIDEO OF DASH AVAILABLE BUT I AM NOT ABLE TO UPLOAD ALL.

The left rear internal "top-hat" parking brake shoes suffered a total manufacturing bonding failure, causing the friction lining to completely delaminate and detach from the metal backing plates inside the rotor hub. This triggered Diagnostic Trouble Code (DTC) C060B (Left Park Brake Actuator Circuit). The failed components were replaced by the servicing facility and are unavailable, but the official dealer diagnostic scan sheet and itemized repair invoice are preserved and available for inspection upon request. Safety was compromised in two ways. First, the mechanical failure completely disabled the electronic parking brake system, forcing a heavy-duty truck to rely exclusively on the transmission's parking pawl to remain stationary. This creates a severe rolling vehicle hazard, especially on inclines or when hauling/towing heavy loads. Second, when these shoes disintegrate, the loose friction debris trapped inside the enclosed drum can shift, wedge, and cause a sudden mechanical wheel lockup or severe brake dragging at highway speeds, threatening vehicle control. The problem was officially confirmed and diagnosed by an authorized General Motors dealership service center. The technician scanned the vehicle, retrieved DTC code C060B, and confirmed upon inspection that the internal parking brake shoes had completely disintegrated. There were absolutely no physical symptoms, abnormal noises, dragging sensations, or brake pedal changes prior to the failure, as the parking brake shoes sit isolated inside the rotor hub. The issue appeared suddenly on May 23, 2026, when the vehicle immediately displayed a parking brake malfunction warning lamp on the instrument cluster dashboard and completely refused to engage the electronic parking brake.

Ever since I bought this truck new, I noticed a lot of metal shavings and debris in the oil filter every single time I changed the oil. I took it to the dealership multiple times to have this looked into before the engine recall came out. The dealership took pictures of the metal and sent them to a General Motors engineer, but the engineer just told them it was "normal." Later on, the truck went in for the official recall inspection, passed the PICO test, and nothing was fixed. Then on August 4, 2026, I was driving on a crowded expressway right through a construction zone with absolutely no shoulder to pull over on. Out of nowhere, the truck started hesitating badly, lost power, and the engine started making a really loud knocking noise. It barely ran, and it was incredibly dangerous because there was nowhere to go and traffic was heavy. Luckily, I was able to limp the truck along just far enough to clear the construction zone and pull over safely. the truck was towed to the dealer were they confirmed the engine was blown, and needs replaced.

Ever since I bought this truck new, I noticed a lot of metal shavings and debris in the oil filter every single time I changed the oil. I took it to the dealership multiple times to have this looked into before the engine recall came out. The dealership took pictures of the metal and sent them to a General Motors engineer, but the engineer just told them it was "normal." Later on, the truck went in for the official recall inspection, passed the PICO test, and nothing was fixed. Then on August 4, 2026, I was driving on a crowded expressway right through a construction zone with absolutely no shoulder to pull over on. Out of nowhere, the truck started hesitating badly, lost power, and the engine started making a really loud knocking noise. It was barely running, and it was incredibly dangerous because there was nowhere to go and traffic was heavy. Luckily, I was able to limp the truck along just far enough to clear the construction zone and pull over safely.