GMC Complaints

BATTERY: Vehicle died at highway speed 1/12/23 with 25,404 miles on it. Towed to dealership, battery died while driving. Vehicle would not start 12/01/24 at 88,013 miles, battery was dead. ENGINE: Reported engine knocking and high idle 1/30/23 with 26,608 miles on vehicle. In service department until 03/03/03 with no issues found. Took vehicle to another dealership service department 06/06/23 with engine knocking and high idle, no issues found. Received back 06/12/23. Filmed the engine noises and high idle on 06/22/23, engine light came on and returned to service department at 37,265 miles. Engine was replaced after a lengthy wait time for replacement. Cam and Lifters were the issue in original engine. Received vehicle back 08/30/23. MODULES: Reported the display changing 1/30/23 with 26,608 miles, service documents state related to telematics controls. They replaced the module. Vehicle had a delay in shifting, reported on 06/06/23 with 36, 303 miles. Transmission control module was out of calibration and was reprogrammed at a dealership service department. Vehicle shifted into neutral multiple times. Reported to service department 09/08/23 at 38,183 miles. The transfer case lost communication with the brake control module, but they started communicating again without repairs according the service invoice. Then there was a recall for the screen switching displays, which it has done the entire ownership, even after replacing the module. Turned into dealership for that recall, it was updated, the displays still change screens while the vehicle is in use.

I was driving at approximately 25-30 MPH, accelerating from a stop light and I felt a clunk, heard a grinding noise and my back wheels locked up. It was snowy/icy conditions so the back end of my pick-up slid out to the right a little bit before the wheels unlocked and I was able to regain control. I could have slid off the road or into another vehicle had the wheels remained locked. The computer system then alerted me to a transmission issue and to reduce speed immediately and call for service. The pickup was then unable to shift out of 1st gear. The vehicle has been towed to a dealer and I have been informed the valve body in the transmission has to be replaced which is 8-12 weeks backorder.

While driving all displays, gauges, screens shut off. Unable to determine speed or anything. Car still drives but there is zero driver feedback. System will come back on and the it will happen again. Has been going on for 2 years. Dealer unable to determine the issue.

Vehicle gives, “Driver assist reduced Drive with care” warning randomly. Lane change will no longer work and engine light will come on. Problem is sporadic and does not stay active. Engine light will shut off after a day. Once vehicle is shut off cooling fan runs extremely loud and for a long period of time draining battery.

At 59000 miles my lifters were rebuilt on the 6.2 liter engine because of a failure in the 1 and 3 piston. Gm paid for the repairs and then At 79000 miles the motor completely blew resulting in complete failure and seizing the motor and heavy metal chips were reportedly found in oil pan. Gm claimed it was a result of me not doing regular oil changes however I suffer from OCD and I am automotive engineer and my oil was changed early in most cases with my truck. Gm will not take responsibility and at the time they wanted $16k to fix my truck. I was going through a very tumultuous divorce and had to pay atty $34k for that wnd could not pay $16k for a new engine resulting in me having to give my truck back to bank and I have not been able to buy a truck or vehicle since then as it ruined my once perfect credit of 820. It’s changed my life forever and GM should take responsibility. I will never buy another GM product again and my father worked for them my whole life and my family only drove their products.

V8 6.2L ENGINE on [XXX] at approximately [XXX] exactly 10 months after purchasing the Denali at 9,484 miles my Denali started to make loud noises and when we got to the stop light [XXX] and [XXX] in Long Beach California the Denali started to shake violently and ultimately shut down in the middle of the road. My daughter and I were traveling on the way home from the doctor’s office and when Denali shut down, I called AAA, and they advised me to call 911 since Denali locked up in park and could not get it in neutral to push the truck to the side of the road. This was very dangerous as vehicles were speeding past us. We stayed in the vehicle until an officer arrived. Then about 15mins later the tow truck arrived and made the area safe with cones and flashing lights. I did put my hazard lights on but in the middle of the day it was very hard to see. AAA was able to disengage the parking to neutral as he mentioned that he just towed another Denali off the road. This is a huge concern for my family and me. I didn’t get to see how he did it because I was with my daughter safe in the Tow Truck. AAA then towed the truck to Penske GMC in Cerrito Auto Square and arrived at 1:48pm. Service advisor then said to leave at garage door and will assess the vehicle tomorrow morning. Albert, the Service advisor, proceeded with giving me paperwork for the Denali and an Enterprise rental car that was located across the street. We had to walk because the shuttle was down (another concern). Albert the service advisor called me the next day [XXX] and advised that the first auto technician suggested the motor seized up. I was advised to wait until the Engine Specialist assessed the motor. Albert the service advisor calls me March 5,2025 @ 11:15am and Engine Specialist did confirm that the motor did seize up and will need a new one. The motor will take approximately 2 weeks to arrive and 3 days to install. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I was driving my truck on I-65 around 75mph and the engine just shut down. I had to maneuver the vehicle out of traffic onto the side of the interstate. It would not restart. I had it towed to my dealership and they told I experienced total engine failure. It was caused by internal bearing failure

On February 18,2025 I texted the imperial valley gmc technician because started hearing a motorcycle noise like and wanted to schedule oil change. Never responded. On February 22, 2025 while driving the the desert in the night we heard a loud noise, like when the tires get debri and the motor of the vehicle lost power. We pulled over as we could and the truck didn’t want to start. I called the dealer for an advise with no answer back. As I could I towed the truck to the dealer on March 6 and finally March 26 spoke to technician and the motor had to be replaced. Is on back order and it will take 3-4 weeks. I’m concerned because the truck didn’t gave any warning just left us on the road. I was really scared because it was deserted area and no traffic. Really unsafe in that truck.

Engine lost power and I had no acceleration. It happened out of nowhere at 70+ miles per hour.

While driving the car went into power save mode and completely shut down. There were no prior lights or warnings that the car was having issues. While driving at 45mph on a busy road it just suddenly shut down. It would not move to get it out of the road. I was almost hit from behind. After the car was towed, it was diagnosed as a broken vacuum pump and exhaust camshaft. Our Terrain only has 67,773 miles at the time of the incident which was unfortunately just outside of warranty. Since this incident and the repair, the car has had to go back to the shop 4 times. It is still not driving correctly and stalled as I pulled out onto a main road almost causing an accident. Still working on getting it diagnosed and repaired correctly. The mechanics I have spoken to indicated this engine/car is known for these issues. Without any warning lights or signs of issues prior it really put us in a dangerous situation.