GMC Complaints

The contact owns a 2010 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 21V053000 (Air Bag). The contact stated that while the vehicle was parked, he became aware that there was a crack on the top of the infotainment system on the dashboard. The contact stated that a month later, the vehicle was taken to a dealer for the recall repair. The vehicle was repaired, but there was a large hole approximately one to two inches in size on the driver's side dashboard near the defroster vent. The manufacturer was notified of the failure. The failure mileage was 102,928.

I purchased this new 2026 GMC Sierra 1500 on 07/16/2026. Beginning shortly after delivery, the vehicle began intermittently losing ALL audio, including the audible turn-signal indication. The condition now occurs approximately once every 3–4 vehicle starts/uses. When the failure occurs, there is no audio from the infotainment system, radio, Apple CarPlay, Bluetooth, or speakers, and there is no audible turn-signal sound. Because the failure also eliminates audible driver feedback from the turn signals, I am concerned this is not simply an entertainment-system issue. The vehicle is available for inspection upon request. The vehicle was presented to Ed Morse Sawgrass Auto Mall, an authorized GMC dealer, after the condition occurred again on approximately 08/20/2026. The dealer advised me that the vehicle already has the applicable software programming and that GM is aware of the condition. The Service Manager advised me in writing that GM currently instructs the dealer to recover/reset the radio and not replace the radio or amplifier because GM is working on a permanent correction. Restarting the infotainment system, Safe Mode, disabling Quick Startup, and allowing the vehicle to completely power down have not permanently corrected the condition. A full shutdown may temporarily restore the audio, but the failure returns. There are no warning lamps or messages before the failure. The audio simply does not function when the vehicle is started. The vehicle currently has approximately 976 miles. There has been no crash, fire, injury, or fatality. I have also formally reported the condition to GMC Customer Assistance. GMC Case #108458085.

The truck when put in parking it still roll forward a little bit. Back up camera can’t not see during night time. Dealership stated they will not solve that problem and tell us to do manually by turn around look back. The suspension really bouncy but the tech stated that is normal. Spoke to other 3rd party tech they said that not normal at all.

At approximately 14,000 miles, the 6.2L V8 engine experienced a major failure due to a spun main bearing, which resulted in the complete replacement of the engine. The vehicle remained at the dealership for more than 60 days while the repair was completed. After receiving the vehicle back, it operated without any significant issues until approximately 30,000 miles, when the engine experienced another major failure. This second failure was attributed to the lifters, and the engine required substantial repairs and ultimately had to be rebuilt. Having two major engine failures before reaching 30,000 miles—first requiring a complete engine replacement and then requiring the replacement engine to be rebuilt—has raised serious concerns regarding the vehicle’s long-term reliability and durability.

The contact owns a 2006 GMC Envoy. The contact stated that while driving various speeds, there was an abnormal burning odor coming from the front driver’s side door circuit board. There was no warning light illuminated. There was a white and grayish smoke coming from the door panel. After removing the door panel, the contact discovered that the source of the smoke was coming from the wiring inside the door. The vehicle was taken to an independent mechanic, and the contact was informed of NHTSA Campaign Number: 15V599000 (Visibility); which the mechanic related to the failure. The vehicle was then taken to a dealer, and the contact was informed that the driver’s side door switch module needed to be replaced; however, the contact declined the dealer's estimate for a comprehensive wiring inspection. The vehicle remained unrepaired with the dealer. The manufacturer was not notified of the failure. The failure mileage was unknown.

Vehicle was traveling at 65 mph on a busy highway when vehicle engine stopped. A message on the dash appeared indicating to driver to shift to neutral and try to restart engine. As vehicle was quickly loosing speed it was decided to coast to the side of road to avoid someone running into vehicle causing multiple cars to crash. After stopping vehicle, an attempt was made to start vehicle. Engine would not turn over. Vehicle was towed to dealership. The following day I was informed that the engine needed replacement.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed and the vehicle started jerking and shaking before unintendedly accelerating. Additionally, the vehicle jerked and started to lose motive power. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 108,000.

I have a 2024 GMC Yukon Denali equipped with the 6.2L L87 V8 engine. The vehicle has approximately 23,000 miles. The vehicle previously underwent the remedy associated with the L87 engine recall. The engine now uses SAE 0W-40 dexos R oil and has the corresponding 0W-40 oil fill cap. After the recall remedy was performed, the check-engine warning light began intermittently FLASHING while I am driving. The light may flash for a period of time and then turn off again. I have also intermittently experienced the engine running rough or the vehicle shaking while idling. I have noticed the flashing warning light occurring while the engine is under load, including while driving uphill. I have video documenting the check-engine light flashing while the vehicle is being driven. Because the condition is intermittent, the warning light is not necessarily illuminated afterward. I am concerned because this vehicle is equipped with the L87 engine that was subject to GM recall N252494000/NHTSA Recall 25V-274 for potential engine damage/failure, and my vehicle appears to have already received the recall remedy. I understand NHTSA is currently investigating reports of L87 engine failures occurring after completion of that recall remedy. The cause of my vehicle's current symptoms is UNKNOWN and has not yet been diagnosed. The vehicle is available for inspection. I am filing this complaint because an intermittently flashing check-engine warning, rough/shaking operation, and the possibility of an engine malfunction or loss of propulsion present a safety concern, particularly if an engine failure occurs while the vehicle is being driven. I do have an appointment with a different GMC dealership for next week instead of the GMC dealership that sold it to me and preformed the original fix.

From time to time since I got the vehicle, the lights flicker inside and out. I've had the alternator changed but it continues. Then when pressing the lock button on the key fob the horn sounds as if it has a shortage. Sometimes its loud and sometimes it's barely heard.

Vehicle: 2026 GMC Sierra 1500 AT4 (3.0L LZ0 Duramax Diesel) Current Mileage: ~16,500 miles Check Engine Light Status: NO Check Engine Light active Description of Incident & Symptoms: •Interstate Incident: While driving at highway speeds, a severe drivetrain vibration occurred (felt like a rear wheel weight flew off). •Dashboard Warnings: Within 5 minutes, intermittent "Traction Control" and "Forward Collision Warning" alerts appeared on the dash, accompanied by a sudden drop in engine power. •Engine Noise & Idle: Once safely pulled over, the engine exhibited a loud mechanical knock and a very rough, unstable idle. •Extended Crank: After shutting the engine off and waiting a few minutes, restarting the truck took roughly twice as long as normal (long crank/delayed start)