GMC Complaints

Front left brake was locking up. Happened 1st a couple months ago. Happened again recently and was towed to dealership. Burning smell from brake and hot in wheel area. Left front brake caliper was locked, pads overheated, rotor warped. Replaced front left caliper, front left brake hose, front pads, and front left rotor. Road tested, brakes operate properly. Brake life on monitor shows 18%, brake pads are at 8mm Out of calibration, reprogrammed brake system control module and performed brake percent calibration per bulletin #25-NA-282. Warranty code is 28YZ314171448.

We had the L87 engine recall completed at 14,318 miles on Nov 20, 2025 on our 2023 Yukon XL Denali with the 6.2L engine. Engine passed all tests by dealer and we were sent on our way with 0W-40 and a new oil cap. Fast forward to Jan 21, 2026.... My wife pulled the vehicle out of driveway and noticed a deep pitched, knocking sound. She slowly started to drive down the street a bit and then the vehicle shut off and displayed a warning message on the dash (this was on a cold engine, not due to the absurd auto start/stop feature). She was able to restart and get vehicle back to the garage. We had just rolled 15,000 miles on the odometer the day before. Immediately called our dealer and had an appointment set for the next day. We were able to drive vehicle to dealer with knocking and reduced power during the drive. Dealer confirmed next day that an excessive amount of metal was found in oil and on oil filter element then supplied us with video evidence. A complete teardown has been ordered but no cause has yet been identified as of Jan 29, 2026. Service tech stated as we walked back into the dealer that "you are getting a new engine based on the amount of metal found in the oil sample". I asked about timeline for engine replacement and was told that we are looking at a month if not longer until we will get the vehicle back. We know that we are VERY fortunate to not have had the engine shutdown happen on a highway as my wife would have most certainly panicked in the situation possibly leading to a catastrophic event.

Vehicle has 2200 miles, equipped with the Diesel engine and failed at a red light. GM has to install a new engine.

Rear wheel lockup event in traffic while towing 24000lb 5th wheel on freeway. Vehicle was limped to a dealer, diagnosed as a transmission valve body failure. Repair took over 1 month stranding us over 1500 from home while on a trip.

I own a 2020 GMC Terrain with approximately 110,000 miles. While driving in winter, the vehicle suddenly lost cabin heat and defrosting capability. The temperature gauge began fluctuating and the cooling fans continued running after the vehicle was shut off. A mechanic diagnosed the cause as a cracked radiator that allowed coolant to leak out, which is a known frequent failure on this model. Because the heater stopped working in sub-freezing temperatures, this created a safety hazard due to lack of defrosting and heat while driving. The failure occurred without warning, and no coolant warning light was displayed before the heater stopped working. The vehicle was not overheating at the time, but the loss of heat and defrost made winter driving unsafe.

Full system error codes displayed on dashboard, Drive Train Error, Steering Colume error, brake system error, "Car will not operate a speed greater than 40 mph, happened 3 times dealership on first inspection advise it was an interface with the factory installed Lojack system and disconnected, Last same sincerio (note..no Lojack connected) same as above the new diagnosis is the battery low voltage to system and throwing everything off.

After heavy rain or a carwash, the door locks and lift gate don't work from key fob. And the vehicle says no remote detected and has trouble starting. After a day or two they start working again. It caused U0422 (invalid data received from body control module). On forums it says it can be water leaking into the vehicle and shorting out the BMC from either the HVAC drain or a weatherstrip somewhere. Now my rear passenger door locks don't work at all. Dealer wants to replace the actuators but can't find the root cause of the problem. Issue has been going on for over a year now.

The front impact sensor, also known as a crash sensor (part # 10370150), is no longer functional. It detects rapid vehicle deceleration during a frontal collision and sends an immediate signal to the Airbag Control Unit (ACU) to deploy airbags. Located behind the front bumper or on the radiator support, these sensors measure impact severity to ensure airbags deploy only when necessary. This part is no longer available from GM or any other aftermarket distributor. It is a critical part for any occupants in a crash. I am just one of many people who cannot make safety corrections.

The truck automatically engages the parking brake ONLY when on an incline, never at any other time. I am so used to engaging the parking brake at all other times I also engage it when on an incline. The problem is the truck DISENGAGES the brake automatically after I've engaged it. This has happened multiple times when I've been towing a large boat on a launch ramp or towing my heavy 5th wheel. I can be fully exited from the truck and 10 ft away when it disengages and I watch it lurch forward. Simple answer would be for me to not engage the brake on an incline, but its a total habit all the time so I never remember to not engage it on an incline. This is a dangerous feature that needs to be removed ASAP. Thank you

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving 65 MPH, the vehicle was shaking abnormally with the check engine warning light illuminated. The contact pulled over to the side of the road and had the vehicle towed to the residence. The contact referenced NHTSA Campaign Number: 25V274000) (ENGINE AND ENGINE COOLING) as a possible cause for the failure. A dealer was not contacted. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 66,456.