GMC Complaints

I JUST PURCHASED THIS 2019 GMC YUKON DENALI. ABOUT 3 WEEKS AFTER; THE MESSAGE "SERVICE TRAILER BRAKE SYSTEM" STARTED BEEPING...DIDN'T REALLY PAY BOTHER ME AT 1ST SINCE I WEREN'T PLANNING TO PULL ANYTHING. THEN IT STARTED DOING IT MORE FREQUENTLY. NOW IT IS CONSTANTLY DOING IT EVERY FEW DAYS. CAN'T SEEM TO GET IT TO STOP. VERY ANNOYING... ANY SUGGESTIONS?

The contact owns a 2021 GMC Yukon. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted and confirmed that parts for the recall repair were not yet available. The manufacturer was not made aware of the issue. The contact had not experienced a failure.

I WAS DRIVING ON HYW 64 IN CASHIERS, NC 28717 ON AUGUST 25, 2025 AT AROUND 4:30 PM AND MY 2022 GMC YUKON DENALI JUST STOPPED IN THE MIDDLE OF THE ROAD. I WAS UNABLE TO RESTART IT SO I WAS NOT ABLE TO MOVE IT FROM THE MIDDLE OF THE ROAD. SOMEONE PASSING BY CALLED 911 SO LOTS OF EMERGENCY VEHICLES ARRIVED. THE MEN TRIED TO SWITCH THE CAR INTO NEUTRAL SO IT COULD BE TOWED AND FINALLY WERE ABLE TO DO THAT READING SOMETHING IN THE MANUAL ABOUT HITTING THE START BUTTON TWICE. WHILE BEING PUT ON THE FLATBED IF THE TOW TRUCK I NOTICED THE TIRES WERE NOT ROLLING, JUST SLIDING FORWARD. IT IS BEING TOWED TO A CHEVY DEALER AN HOUR AWAY.

My 2018 GMC Acadia is having the shift to park error. Causing it to not park; or error it causing us not to be able to turn vehicle off or know if it's in park. It pops up multiple times.

My rear wheels randomly lock up and truck violently shakes. It does it randomly in very long trips so GM and every dealer I've brought it to just says that "they cant help me because they cant get it to replicate. Had the same issue with my 2020 and it has an open recall for the exact same thing. This is very dangerous and is going to get someone hurt one day if gm isn't help responsible and fixed their valve body failures for ALL of the 10L1000 L5Ps. Not just 2020-2022....it's ALL OF THEM. 2020-2025!!!

I have brand new GMC Terrain 2026, I leased dog on Aug 4th 2025. After one week into driving the vehicle, OnStar, GPS NAV stopped working and the Emergency calling is not working. All features related to locating the vehicle through OnStar or through google stopped working, in addition to SoS not working. I took it to the dealership they said the Telematics module needs replacement.

Subject of the problem: Service brakes/Hydraulic brakes Problem of the vehicle: While driving, the brake pedal sometimes suddenly goes all the way down without resistance, and the vehicle does not slow down as expected. In order to regain brake pedal twice. Frequency of the problem: This issue occurs intermittently, but it poses a serious risk because the vehicle may not stop when needed. I already had the brake booster kit and hose replaced at an authorized GMC dealership because I was told this was the cause. However, the exact same problem continues to happen after the repair. Safety concern: This appears to be a defect that affects braking performance and safety. The issue occurs intermittently while driving (e.g., at stop lights, low-speed braking, or during normal driving). It has happed multiple times since the repair. This problem could cause loss of braking power and result in a crash. It is extremely dangerous and has not been resolved by the manufacturer's recommended repair. I have called the GMC service center at 18004678782 and 18002221020 with this problem. They told me that they could do nothing about it and to deal with the dealership directly myself and they can not do anything. I have talked to the dealership but they just tell me there was another problem other than the initial problem they told me. The dealership did the first checkup and that problem was not fixed. Then went in again because the same problem was happening so they did another checkup and told me there was another problem not the initial problem they told me. The second checkup they did, the part and labor was $2,700. I went in with the same problem and have to pay that much. The problem was not solved with the initial diagnosis they gave and now have pay extra ($2,700 - second checkup price) to fix the problem they did not fix. Thank you.

Odometer Fraud. The contact purchased a 2008 GMC Sierra 1500. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 126,498. It was later discovered that the mileage on the title was approximately 250,205.

Vehicle brakes stopped working while driving. Dash board lit up and stated system brake failure. Also stated “do not exceed 43mph”

On Thursday August 14 while driving our traction control light and engine light came on along with the ESC light while traveling out of state. The car felt like we were driving on a rumble strip. We immediately took it to the nearest auto repair shop, only a few minutes away. They reset the battery and dash lights and we took it for a test drive. All the lights came back on after a couple of feet and loud knocking sounds started. Our emissions light then also came on and a strong exhaust smell was emitted. Each time the engine was started the knocking grew louder and the engine was severely struggling and sounded very wrong . The shop put their diagnostic tool to use and identified misfiring on cylinder 5. Upon further inspection they identified camshaft irreparable failure. We had it towed to the Platteville WI GMC Dealership Friday Aug 15. Where they confirmed camshaft failure and informed us our engine needed total replacement. Our safety was at risk since our engine failed while exiting the highway.