GMC Complaints

I had an incident in my 2020 GMC Yukon, where the forward collision crash alert went off and there was total loss of brakes. The brake pedal went to the floor. After the crash alert ended, the brakes returned. This happened on the highway and could have turned into a disastrous event. The dealership has been unable to diagnose or recreate this issue. They claim they did not find anything and the vehicle is safe to drive. I have turned off the collision detection system in the meantime. I feel strongly that this is a software issue that needs addressed. GM has replied that they support the dealership but if I want a second opinion I can go to another dealership for input.

Lifter failure, resulting in costly repairs and possible catastrophic engine failure while driving. Vehicle has 78,000 miles and has been regularly serviced.

My 2023 GMC Acadia consistently makes a sound at lower speeds when it is changing gears. For example, accelerating or accelerating for stoplights. The sound is kind of a ka clunk. The technician can find nothing and does hear the sound when we go for a test ride. I am worried that the sound indicates a transmission problem. The VIN search does not show a recall for my vehicle.

While traveling on a major Route, the truck just turned off while driving. The truck was stuck in the middle of a two lane major route. Truck would not start or turn on. I was unable to put hazards on or put the truck in neutral. The engine siezed due to the GM recall. After having the engine replaced by a certified GM dealership, a few days later the Throttle body stopped working. Again, keeping me stuck. Certified GM dealership had to replace the throttle body.

Was driving down the highway and was approaching a red light. As I was slowing down my transmission down shifted hard and my rear wheels briefly locked up and my truck went in to reduced power Took to dealership only to find out the valve body failed and my truck wasn't covered

I was out of town and driving on the highway around 75 MPH, when the motor suddenly lost all power. I was driving in the far left lane approaching an overpass. The sudden loss made it next to impossible to make it off the overpass on a very busy freeway safely while trying to navigate many cars trying to pass me . The truck came to a complete halt on the white shoulder line, 50' off of overpass SH 31. The truck would not restart or do anything i could not push it any further off road. I excited the e truck and stood off the freeway for my safety, as the truck was on very edge of freeway. GMC Roadside assistance took my truck to nearest dealer. This occurred on a Friday, dealership gave me a loaner car to get home as i was from out of town. They stated it would probably be the following Tuesday maybe Wednesday before they could tell me anything. I never heard from dealership service department, so i called them on Thursday morning and was told my truck motor had seized up and a new motor was needed. Service advisor stated GMC had been contacted and paper work started and I would be getting a new motor. The service advisor also stated that he had called and left a message. We verified my phone number and he had correct number, however I still never receive a call or voice mail. I still have not received any documentation on the failure or a repairs needed.

Transmission started hash shifting and at highway speed it felt like the dark converter kept falling out of lock up. Stopped and took picture of service light

I am submitting supplemental information regarding Complaint #11716907 involving a 2026 GMC Yukon XL AT4 equipped with the Brembo brake package. Following my original submission, GM's Executive Resolution Office provided written clarification of its disclosure position. GM states that the spare tire compatibility limitation associated with the Performance Brake Upgrade is disclosed through a hang tag affixed to the spare tire/wheel assembly mounted beneath the vehicle; and the owner’s manual. GM has not indicated that this limitation appears on the Monroney label, buyer’s order, or delivery documentation. The hang tag provided to me as an example states that the original spare tire/wheel does not fit the front axle when the performance brakes are installed. It instructs that, in the event of a front-axle flat, the consumer must install the spare on a rear wheel position & move a rear wheel to the front axle; and stow the flat tire. The spare tire is mounted underneath the vehicle. The tag is attached to the spare assembly and exposed to road conditions. In my case, when the spare was accessed following a roadside flat tire event, only a small piece of yellow plastic remained. Additionally, no printed owner’s manual is provided at delivery. During my roadside event, the dispatched service provider was unaware of any two-wheel rotation procedure and attempted to install the spare directly on the affected axle. The incompatibility rendered the spare unusable at that time. My concern is that current owners of vehicles equipped with the Performance Brake Upgrade may reasonably assume that a “full-size spare” is compatible with all wheel positions. Unless the undercarriage hang tag remains intact and is specifically read at the time of a flat tire, the incompatibility and required rotation procedure is not apparent. GM has not indicated it intends to notify new or existing owners regarding the spare tire limitation and required rotation procedure.

ON 2/22/2026 WE WERE DRIVING BACK FROM WEST, TEXAS ON FM 2311 WE WERE TRAVELING AT ABOUT 60 MPH POSTED SPEED LIMIT WHILE WE WERE ENTERING TH ECONSTURCTION ZONE THE VEHICLE SAID START THE CAR WE WERE DRIVING IN THEN I NOTICED WE LOST PROPULSION AND STEERING AND BRAKES WERE VERY DIFFICULT TO HANDLE MY WIFE AND 10 YEAR CHILD WERE IN THE VEHICLE WITH ME. THIS ROAD HAD NO SHOULDERS AND A VERY STEEP DEEP EMBANKMENT ON BOTH SIDES OF THE ROAD. VERY DANGEROUS SITUATION. WE WERE TRAPPED BETWEEN TWO HILLS WITH NO WAY TO STAY SAFE OR GET THE VEHICLE TO A SAFE SPOT TO KEEP TRAFFIC FROM HITTING US OR THE CAR WE HAD TO GO STAND DOWN THE BOTTOM OF THE EMBANKMENT TO TRY AND STAY SAFE AS BEST AS WE COULD. THE LEROY TEXAS VOLUENTEER FIRE DEPARTMENT CAME UP ON US AND WAS ABLE TO BLOCK TRAFFIC UNTIL THE CAR WAS TOWED TO OUR HOME THEN TO FREEDOM CHEVROLET IN FAITFIELD TEXAS ON2/23/2026 ON 2/23/2026 WE MADE A CLAIM WITH GM CLAIM#89328131 AND HAVE BEEN IGNORED BY THEM TOLD THEM A ENGONE REPLACEMENT DOES NOT FIX THE SAFTEY ISSUE PERMANTLY SO I AM REPSPECTFULLY REJECTING THE REPAIR TOLD DEALER NOT TO FIX. WE HAD A RECALL DONE ON 11/17/2025 FOR THIS ISSUE AND IT FAILED US WE COULD HAVE BEEN KILLED OR SEROIOUSLY INJURED. THIS IS A MASSIVE SAFTEY ISSUE WE EVEN ASKED GM FOR A BUY BACK OR A SWAP AND WE CALLED TODAY ON 2/27/2026 AND GM TOLD US JOHN WHOEVER THAT IS WOULD CALL US BACK NEVER CALLED US. GM EVEN ACTED LIKE THEY COULD NOT FIND THE CLAIM NUMBER WHEN I HAVE AN EMAIL ABOUT IT. i AM NOW VERY WORRIED THAT GM WILL TRY TO ERASE ALL THE DATA FROM THE VEHICLE RECORDING DEVICE AKA BLACK BOX. GM MUST BE HELD ACCOUNTABLE I OWN 3 GM VEHICLES WORTH A TOTAL OF ALMOST 300K ALL HAVE A MAJOR SAFTEY RECALL .

Upper radiator hose connection to radiator is faulty causing leak of coolant. Yes it is available for inspection upon request. Truck began to run cooling fan at full speed in the middle of winter with no warnings of high heat or low coolant. After two weeks, check engine light finally cut on to indicate low coolant flow. Coolant reservoir was subsequently checked and found to be completely empty. It is apparent this reservoir had been extremely low / empty for at least two weeks with no warnings. Without proper warning and leaking coolant, truck could have overheated. Should this had happened in dead of summer, truck could have very well overheated with no warning. The problem was investigated and confirmed by dealer as leaking coolant at the connection of the upper radiator hose to the radiator. Was quoted $983 to replace the hose. No warning lights appeared until issue had been ongoing for over two weeks. A quick search of "GMC Canyon Upper Radiator Hose" will reveal many identical occurrences of this issue. This is a safety hazard / design flaw that GM is not acknowledging and is putting the burden on the vehicle owners for their own issue.