GMC Complaints

I noticed there was an issue regarding the break assist system in my vehicle a few months ago when I went to go for a drive. It is available to be inspected. The issue regarding safety revolves around the difficulty to break. The low amount of brake availability is dangerous in the case of a situation that if I needed to break quickly it is extremely difficult to. I have not had a certified individual confirm the issue at this time. It has not been inspected. The warning message "Break Assist" comes up every time I try to utilize the brakes. I know there are previous recalls, although when I have tried to see if my truck falls under those recalls it does not.

I heard tapping coming from the engine while it was running. Once I took it to a shop it was determined that the lifters and the camshaft was damaged and needed to be replaced.

The trucks engine completely shut down while going approximately 60 MPH while merging onto the highway. The trucks dash flashed multiple times, a ticking noise was heard, it put itself in neutral, and shut the engine off. All power was lost. I did still have brakes. Safety was a concern as there was a vehicle behind me entering the highway too. Cars to my left as well passing at highway speeds. Once I got the vehicle stopped on the shoulder of the highway it put itself in park. It would not restart. The vehicle was towed to a local GMC dealer. There were no warning lights of any kind that came on. No indication that there was a problem. A couple days later I was informed that the truck would need an entire new engine upon inspection. I was also told by the dealer that the truck had no oil at all in it. The engine consumed it internally by their evaluation.

Sudden loss of power while driving approximately 60 MPH. Dash saying "press engine start". The vehicle lost all functions while moving at about 60 mph with zero warning signs. After diagnosis with the GMC dealer, crank bearing failure led to complete motor loss. The concern was there was no warning signs, noises etc. that would allow to get the vehicle to a safe location off the road. We were lucky we were going straight and not on a corner and able to coast to a wide enough location to get the vehicle off the main lanes of traffic.

I have a 2018 GMC Sierra 1500 with a 6.2 motor. Back in December of 2024, I had to replace a tie rod, cam shaft, and the lifters. $8400 to get everything replaced. Since my warranty had expired, I had to pay all of this out of pocket. I know there is currently an investigation going on in GMC's 6.2 motors. Almost 900,000 engine failures. This is unacceptable. GMC just needs to man up and send out the recall notice. Since I have already had to pay for my replacements, GMC should do the right thing and and cut me a check.

January 16, 2025: Driving down the interstate near Atlanta Ga going 75 MPH, our 2023 Yukon Denali with 28,585 miles on it, abruptly started gearing down. The vehicle would not accelerate, it was coming to a stop on its on. Traffic was very heavy and it was a very scary situation. After managing to get the vehicle barely off the interstate it totally lost power and would not start. The vehicle was towed to the local GMC Dealership and within 30 minutes they told us the engine had locked up. We had to get a rental car to continue our trip and haven’t had much luck, so far, getting reimbursed. As of today February 6th, GMC cannot give us an estimated repair date as our engine is on back order!

Purchased this vehicle on 06/29/2023 from Robideaux Motors in Coeur d Alene ID. with 81,397 mile on the odometer. On 01/05/2024 the 6.2L engine with 84,109 miles, started having a ticking sound after starting it at my son's house two miles from home. I called the dealer and was told to bring it in for diagnosis by a tech. While driving the truck to the dealer the ticking got worse and motor started to shudder and the check engine light came on. Cause was a misfire on cylinder 4 due to bent push rod and failed lifter. Replaced lifter bank 2 with new push rod. Total cost was $2,852.74 (have invoice). After many calls and letters to my extended warranty company, they finally paid $1688.54 of the total cost. On 08/29/2024 the same ticking sound started again as well as the shudder and check engine light. I had it towed back to Robideaux Motors and was told it was a misfire on cylinder 6 due to lifter failure. Robideaux Motors did repair under their repair warranty. I know that this vehicle is not included in class action suit, due to the year. I feel this to be a continuing problem with the GM 6.2 and 5.3L motors encompassing many model years. Just wanted to document that the number of years covered in the law suit should be expanded.

While idling, I noticed a knocking sound. Dealership found that rockers on both banks not rotating from lifter failure. Dealership replaced both lifter banks. Luckily this was caught early and was corrected for engine failure.

At 9,900 miles my safety camera system failed which disabled the cruise control and all safety features that used the camera. Car was out of service for nearly two weeks and subsequently fixed by the dealer under warranty at no charge. At 11,300 miles I was driving on an interstate highway in the left lane at rush hour, without warning the car stopped accelerating the car shifted into neutral and totally lost power. It was a very dangerous situation with me in the left lane in heavy traffic. I am a skillful driver and thankfully I was able to make it off the travel lanes on the highway. The temperature was 18 degrees at the time and I had to wait outside for a tow truck. The engine seized without warning or noise and this presents a severe danger to the driver of the vehicle and other vehicles on the highway. There was a substantial possibility that other vehicles could not avoid me as I was exiting the travel lanes. There was also a substantial possibility that the vehicle would simply be in the travel lane stopped on a divided highway.

Knocking, stalling, shaking, lost of power and steering problems. Serviced transmission twice and I was advised to serve every 30000 miles!!! I owned several types of vehicles but I never heard such things before. Technician told me that apparently many GMC customers reported same problems.