GMC Complaints

We're in the waiting period for our 3rd engine. 1st engine failure, while driving on interstate at 70+ MPH, engine stopped running, causing a very unsafe condition for family and surrounding vehicles. Engine failure 2 days later, towed to dealership for inspection, replacement engine was installed ~4 weeks later. 2nd engine failure, while driving on interstate at 75+ MPH, engine seemed underpowered and would rev upwards of 6000+RPMs, not exactly unsafe, but not usual operating conditions either. Returned to dealer, upon inspection, total engine replacement was recommended.

The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving uphill at an undisclosed speed, the vehicle stalled and failed to return to normal operation. No warning lights were illuminated. The vehicle was towed to a dealer to be diagnosed, and the contact was informed that the engine needed to be replaced; however, parts to repair the vehicle were unavailable. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 83,000.

The contact owns a 2019 GMC Yukon XL. The contact stated that while driving at an undisclosed speed and coming to a stop at a stop sign, the vehicle started shaking violently, with an unknown flashing warning light illuminated on the instrument panel. The vehicle was towed to a dealer and was diagnosed with a lifter failure. The dealer informed the contact that the vehicle was covered under warranty; however, upon a further follow-up, the dealer informed the contact that the warranty had expired. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 47,000.

The contact owns a 2023 GMC Yukon. The contact stated that while driving at an undisclosed speed, the engine seized. No warning lights were illuminated. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was repaired. The contact was informed that the repair was covered under an unknown recall repair. The vehicle was released back to the owner; however, the failure reoccurred. The contact stated that the vehicle was idling roughly and jerking abnormally. In addition, the contact stated that the drive to the residence was not a smooth drive. The vehicle was taken back to the dealer, where a technician performed a ride-along. The contact stated that the engine seized three times during the ride along. The contact was informed that the engine needed to be replaced a second time. The contact stated that when the vehicle was released, the rear bumper was damaged. Additionally, while attempting to start the vehicle, the Forward Collision Avoidance warning light was illuminated. The vehicle remained with the dealer. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 44,000.

The upper part of the grill was rattling while I was on a 270 mile road trip. I stopped, inspected it, and found multiple mounting points cracked. I did not feel it was safe to continue driving with it being so loose so I installed four zip ties to continue my trip back home. Safety recall N242490120 had already been completed which means this is the second time the plastic clips on the grill have failed.

am filing a formal complaint regarding my 2023 GMC Yukon Denali, which experienced a catastrophic engine failure while I was driving on the highway with my family. The sudden failure created a dangerous situation, placing both my family and me at significant risk. As a result of the breakdown, I was forced to pay $260 out of pocket to have the vehicle towed to the dealership. After inspecting the vehicle, the dealership advised me that the engine requires complete replacement. There was no indication that the engine was going to go. Thankfully there was a shoulder on the highway and we were able to pull over. This could have caused an accident could've been fatal.

Engine failure at random while operating. Dealership stated vehicle blew engine block fuse and crankshaft is now seized.

The 10 speed automatic transmission shakes and jumps between gears. The transmission also shakes and rumbles at cruising speeds. The diesel engine version of this truck is already recalled. My truck is a gas engine and should also be recalled. This is the same defective 10 speed transmission used in all GM vehicles and recalled in many. This vehicle needs to be recalled and fix before the wheels lock up and kill someone.

I purchased this new full-size heavy-duty pickup, and at purchase the selling dealer installed a 3-inch suspension lift kit with 37-inch tires on 22-inch wheels as a paid dealer upfit. The lift kit manufacturer publishes a maximum tire size of 35 inches on a 20-inch wheel for this kit; the tires and wheels the dealer installed exceed that spec. The lift manufacturer confirmed directly that they would never approve exceeding the 35-inch tire / 20-inch wheel recommendation. The dealer's assistant manager confirmed that NO calibrations of any kind were performed after the lift and 37-inch tires were installed, and said nothing is recalibrated when a lift is done with 37-inch tires. This vehicle is factory-equipped with forward collision alert, automatic emergency braking, front pedestrian braking, lane departure warning, and automatic high-beam control. These crash-avoidance systems rely on forward-facing camera and sensor aim, which depends on ride height and suspension geometry. A 3-inch lift with 37-inch tires materially changes that geometry. With no calibration performed, there is no assurance these safety systems are aimed or functioning to spec. The truck was also never aligned after the lift and the tires are cupping. The headlights were never re-aimed for the higher ride height, and the speedometer was never recalibrated and reads inaccurately. The oversized tires also contact the body. The left front tire has torn into the front fender, the fender well is misaligned, and it is forcing the lower front edge of the driver's door out of alignment. The dealer's only proposed remedy is to keep cutting the fender wells; the trimming already done has exposed electrical wiring behind the wheel well to mud, water, and road debris. I am reporting this because the assistant manager's statement suggests it may be the dealer's standing practice—other customers may be driving lifted trucks with uncalibrated crash-avoidance systems without knowing it.

The upper top grille mold detached from the vehicle while traveling at highway speed (about 65 mph). It hit the hood, which it scratched and flew off into the air, above the vehicle and in the way of oncoming traffic. Fortunately, no one was behind me so the part did not hit another vehicle. Vehicle had around 65k miles when this occured. I have contacted a local dealership who informed me that while many similar vehicles have a recall for this issue my VIN is not included in that recall.