GMC Complaints

I purchased my vehicle in June 2025. In January of 2026 the vehicle would sometimes shut down at red lights, requiring me to restart. No engine codes would pop up. On Jan. 16th, 2026, I exited my vehicle and heard a “cow bell clunking” coming from the engine area. I scheduled a service, and I was informed that the issue was part of the GM recall for 6.2L engines. This concerned me, because my vehicle had already had the “remedy” for the recall (changing engine oil type) prior to me purchasing it Certified Pre-Owned, and the engine still failed. The dealer I brought the truck to did a full engine (and appropriate parts) replacement as part of the open recall.

The contact owned a 2016 GMC Sierra 1500. The contact stated that while driving approximately 35 MPH, the vehicle crashed into a deer, causing significant damage to the front end. During the crash, no airbags deployed. The cause of the air bag's failure to deploy was not determined. The vehicle was repaired at the local collision center. Recently, while driving approximately 50 MPH, the driver pressed the brakes to decelerate before crashing into a deer. During the crash, the vehicle sustained minor damage to the front end, but all the air bags in the vehicle deployed, including the driver steering wheel air bag, the front passenger side air bag, the driver and passenger side curtain airbags and seat belt pretensioners, and the passenger side seat air bag. The driver's side seat airbag did not deploy. The contact suffered adverse effects of COPD due to the air bag powder during the deployment. No medical treatment was needed. The cause of the failure was not determined. The manufacturer and local dealer were not contacted. The contact indicated that due to the minor damage to the vehicle during the crash, the air bag should not have deployed. The vehicle was towed to a collision center and was determined to be destroyed. The failure mileage was unknown.

Catastrophic brake system failure. When leaving my home in Baltimore County, MD, at approx. 10:00am on February 3rd, my vehicle started up normally. As I descended down a hill in our neighborhood the brake system failed and the vehicle would not stop. By standing on the brake pedal I slowed enough to put the vehicle in park as I entered an intersection with the main road. I have since learned this is the 3rd GMC Yukon (years 2023-2024) that has had the same brake failure in 24 hours in our community.

While driving the truck, it suddenly locks up the steering and I have to maneuver safely to stop. This has happened to me various times and its scary and dangerous.

The contact owns a 2022 GMC Yukon. The contact stated that while the vehicle was parked, there was a dripping sound coming from the vehicle, and the low oil warning light was illuminated. The low oil warning light was illuminated approximately every 1,500 miles after an oil change. After each oil change, the level on the oil dipstick was low. The vehicle was taken to an independent mechanic, where an oil consumption test was performed. The mechanic informed the contact that the vehicle was consuming approximately 25 percent of the engine oil. The vehicle was not repaired, and the contact was referred to a dealer for assistance. The vehicle was not diagnosed or repaired. The contact was informed that an additional oil consumption test was needed. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for assistance. The approximate failure mileage was 87,000.

excessive oil consumption....caused engine to fail....yes, car is available for inspection ...caused the car to lag and initially break down without any warning lights ...confirmed form dealer new engine needed...law suits in other states have proven that this seal problem has been known to GMC for years and they haven't repaired these faulty parts...again, no warning lights came on...please assist

I was driving my 2022 gmc Sierra with the 6.2 engine 10 speed transmission and I was at at a red light, the light turned green and I went to go and I could feel my rear wheels lock up and then it released went into limp mode was not shifting gears correctly and I had no reverse

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered while in first gear. The contact stated that the transmission sounded strained and shifted rough before slamming into gear. The vehicle was taken to the dealer; however, no cause for the failure was found. The dealer diagnosed the vehicle and determined that the vehicle was oversteering while turning to the right. The dealer replaced the valve and torque converter. On another occasion, while driving at an undisclosed speed, the vehicle accelerated independently. Most recently, a burned transmission fluid odor was coming from the front of the vehicle and entered the cabin through the A/C vents. There oil stains found on the ground on several occasions. The vehicle was taken back to the dealer and the valve body was replaced, the fluid levels were checked, and the transmission filter was replaced; however, the failure persisted. The contact called the dealer, and the dealer towed the vehicle. The dealer determined that the oil cap was loose. The vehicle remained at the dealer unrepaired. The manufacturer was made aware of the failure, and a case was opened. The failure mileage was 8,496.

The contact owned a 2023 GMC Sierra 1500. The contact stated that while the vehicle was parked on the driveway, it caught on fire. The contact was inside the residence when a passerby knocked on the door and informed the contact of the fire. A neighbor helped extinguish the fire. When the contact stepped outside, the flames were by the instrument panel; the flames had risen to the rooftop. The front windshield was shattered. The fire was contained to the cabin. The fire department was called. The contact stated that weeks before the fire started, an abnormal sound could be heard coming from the engine. The contact removed the battery from the vehicle. The vehicle was not insured. The manufacturer was not made aware of the failure. The failure mileage was unknown. 

The contact owns a 2018 GMC Acadia. The contact stated that upon parking the vehicle and attempting to release the key from the ignition switch, the key seized inside the ignition switch. The contact stated that either the “Parking Assist” or the “Steering Assist” warning light was illuminated during the failures, and the A/C system became inoperable. The failure had occurred on several occasions. The vehicle was taken to the dealer, where it was diagnosed with Parking Assist and Steering Assist failures. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was approximately 98,000. The VIN was not available.