GMC Complaints

Traveling North bound on Highway 14 in Southern California on January 24, 2025. In the fast lane traveling approximately 70MPH when with no warning what so ever the vehicle shifted into neutral and lost power. Nearly rear ended trying to get out of traffic and to the right shoulder. Once stopped the vehicle would not start, stuck in Park, and could not turn the electronics off. Stuck in vehicle for 3 hours because it was too dangerous to exit vehicle. Tow truck arrived. Tried to jump the battery which by this time was dead. Had to drag the vehicle up the flatbed with wench do to vehicle unable to shift out of Park.

While driving at low speed the power assisted steering quit working. I could steer but with great effort. Drove two blocks home. Shut it off and restarted. Everything was fine after restarting. I’m afraid to drive the vehicle after this experience.

Brakes at low speed do not work well, causing extended braking distance. Looks to be a previous vacuum brake pump issue, but is no recall on it now.

The front chrome grill on my Sierra 1500 SLT has begun to detach, and there is currently a recall for this specific component on my vehicle. I took my truck to GMC Covert Bee Cave to get this recall and 1 other recall fixed, but GM does not have a remedy for grill. Not only does this pose a safety risk to myself, but I use my truck as a source of income by renting it out on Turo, and Turo has unlisted my truck from the app indefinitely or until this remedy is resolved. The paperwork I received from the dealership confirms GM has no remedy for the recall, and they sent me on my way without even offering a replacement vehicle. My truck is available for inspecting if you would like to see it. My safety and others safety is at risk if this recall does not receive a remedy or if GM does not give me a replacement vehicle in the meantime. No warning lights or any other systems can notify me if the grill is going to detach all the way, and I will not be able to have this source of income from Turo without the ability to have my truck relisted.

There is a known defect by other consumers with the same year/make/model as mine that causes the radiator to leak. I replaced the original radiator about a year ago with a new GM radiator (84207654) and it’s now leaking as well.

The contact owns a 2015 GMC Yukon. The contact stated while driving 5 MPH, the brake pedal was depressed, but the vehicle failed to stop as intended. The brake warning light was illuminated. The contact stated that the brake pedal was depressed to the floorboard. The vehicle was slowly driven to the dealer; however, no cause for the failure was found. The vehicle was not repaired. The contact stated that the failure persisted. The contact associated the failure with NHTSA Campaign Number: 19V645000 (SERVICE BRAKES, HYDRAULIC). The manufacturer was not made aware of the failure. The failure mileage was approximately 90,000.

As per several other complaints on the GMC terrain of particular years my vehicle has had a rear main seal leak, a blown engine terrible amounts of oil consumption and now the second engine has malfunctioned. And made the vehicle inoperable. The safety of myself and others was put at risk as the vehicle lost all power and cut off. The problem has had class action lawsuits filed. The first time the engine failed no warnings came on the second time a reduced engine power came on that we had no idea existed. The vehicle consumed oil very quickly, with in days the oil could need replaced. Oil consumption has been going on for years. Even after replacing engine.

On 1 February 2025; I was stuck in the mud, in my pickup. As I was attempting to get out, my truck died. After several attempts to restart my truck; I was towed to my lake camp. Which located less than 100 yards away. Since it was no longer had a current warranty I contacted a mechanic. He arrived the following day and discovered that the engine was “locked up”. I had it towed to his shop, and he began to diagnose the engine. He has determined that the crankshaft is broken and 2 rod bearing are spun. He is currently checking for piston borehole damage. If no other damages are found, he will ordered repair parts and repair my engine.

The contact owns a 2022 GMC Sierra 2500. The contact stated while her husband was driving approximately 75-80 MPH, and the contact was in the front passenger's side seat, the vehicle lost motive power, and the infotainment system and instrument panel turned off unexpectedly. The contact's husband pressed the PUSH to START button, and the vehicle was able to be restarted. There was no warning light illuminated. The contact stated that while driving 70-75 MPH on one occasion, the vehicle shut off unintendedly. The contact exited the highway and pulled into a gas station. The contact stated that upon pressing the PUSH to START button, the vehicle restarted as needed. The contact stated that the failure recurred while driving on a third occasion; however, the vehicle was able to restart independently. The vehicle was taken to the dealer several times, but the dealer informed the contact that the failure could not be duplicated. The contact stated that the failure recurred. The vehicle was taken back to the dealer, where the battery was replaced; however, the failure persisted. The manufacturer was notified of the failure and informed the contact that no assistance could be provided because the vehicle was not covered under warranty. The manufacturer advised the contact to take the vehicle to the dealer while the failure was occurring; however, the contact stated that the failure was occurring intermittently. The vehicle was not diagnosed or repaired. The failure mileage was approximately 4,000.

My check engine light comes on intermittently, since March 2024, after having Cabin & Engine air filters replaced. Each time, I’m told it is code P0171. This has happened too many times for my comfort. Usually, it happens around the time my gas gets below 1/2 tank or after I fill up my gas tank. Originally, I was told by the mechanic that it could be one of four things, of which I’ve now had some of things done. InIn Aug. 2024, the check engine light came in. Code was P0171. Mechanic replaced the Brake vacuum pump. Once incident, almost a month later, on 9/24/24, was very scary. While driving on the interstate, I got ready to increase my speed, but heard a pop sound and noticed the speed wouldn’t accelerate. Next, the check engine light came on and the message in the dash popped up saying “engine power reduced” or something similar. I was able to coast from the fast lane over to the slower lane and off the highway into a parking lot. I turned the truck off. When I crunk it back up an hour later, it was shaking and jerking. While slowly driving, on the way to the mechanic shop, it jerked and shook each time I tried to accelerate after stopping at a light or slowing down with traffic. The code again was P0171. According to the mechanic, the intake hose had popped off. On 11/13/24, the check engine light came on. I again took it to have the code scanned and truck looked at. Test results again showed P0171. This time the Mass Air Flow Sensor was suggested. In a year I’ve had the fuel system cleaned twice, brake system flushed, & other routine maintenance such as oil change & brakes. Yet, my check engine light seems to still come on intermittently atleast once monthly. It came on two days ago, 2/18/25, when my gas was around 1/4 tank full. I added a fuel system injector, per mechanic suggestion, and filled my tank up with gas on today, 2/20/25. The check engine light had gone off within about 15 mins of me driving. I’m certain it will be back on soon with the same code.