GMC Complaints

In November 2023, my lifters collapsed and I had multiple bent pushrods on my vehicle due to the active fuel management system, leading me to become stalled in my vehicle on the middle of the road with no way of getting off the roadway safely. I have had multiple issues with this vehicle, and know many other who have as well. I had been compliant with all routine and preventative maintenance to this point, and I know that this will lead to injuries or fatalities due to these issues that GM is aware of, yet will not do anything to rectify the situation.

My vehicle displayed numerous brake failure codes and limited my speed to 43mph. When taken into my local GMC dealer the diagnostics I was given were a bad/leaking master cylinder. This vehicle has 16,200 miles on it and was never used for towing or hauling. The brakes are hard and brake assist has clearly failed. I’ve found numerous recalls and issues with other year vehicles from GMC, yet they are denying any liability on my vehicle. They want over $3000 to replace the master cylinder even though there’s no physical leak observed via fluid loss. This is a major safety concern when a major brake component fails on such a low mileage vehicle. This truck also has a well known seal leak on the rear window that causes mold to grow inside of the vehicle cabin. Apparently no one has died yet so they have not been forced to put out a recall. Consumers should not be forced to spend thousands of dollars on major components on such low mileage vehicles. Especially when it comes to safety items like braking. I’ve researched this for hours and have found this has been a known issue on these 2020 models many people. Some even brand new after driving them off the dealership lot. Clearly there is an issue and the manufacturer refuses to address it.

The contact owns a 2016 GMC Terrain. The contact stated that while her husband was driving at an undisclosed speed, the front windshield became foggy. The driver rolled down the windows to clear the windshield and the glass; however, the windshield became foggier. The driver was able to pull over to the shoulder of the roadway and clear the windshield by hand. The vehicle returned to normal functionality, but the failure became a regular occurrence. The vehicle was taken to the dealer, who determined that the windshield was collecting excessive moisture from the air inside the vehicle but was unable to provide a specific diagnosis. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 93,000.

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and towing a utility trailer, the contact stated that upon making a left turn, the tailgate opened inadvertently and struck the utility trailer, causing a dent in the tailgate. The vehicle was taken to the dealer, where the contact was informed that the failure was related to an unknown recall; however, the VIN was not included. The dealer determined that the upper part of the tailgate needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 20,500.

I bought my 2019 GMC Sierra in August of 2019. It had 3000 miles when I bought it. It now has 59000 miles on it and is in the shop today for transmission repair. The authorized dealer has flushed the transmission and I am waiting for a call back. The flush will be in the $500+ range and they charge a $165 diagnostic fee also. The transmission shudders, knocks and grabs when I accelerate. It feels like I have been rear ended. It also leaps from a complete stop. It doesn't accelerate smoothly. I feel this is a dangerous situation. I have called GMC Customer Service to complain and they have escalated to someone who is going to call me back in 24-48 hours.

Loss of audio throughout an entire drive/ignition cycle. This includes the loss of the blinker click/clack audio when the blinker is on. When the loss of audio issue occurs, the driver has no audio input indicating a blinker is on even though the actual blinker is flashing to other drivers. Therefore, an unaware driver (due to no audio feedback) with a blinker left on could have another driver pull out in front of them thinking they intended to turn with the result being a collision.

Engine Knock, possible piston rods bent. oil in cylinder. cylinder has not enough compression. No safety issues, was able to drive to mechanic without harming myself or others. this is the second vehicle in my family to have lifter or rods issues leading to major engine work. Check engine light came on after the vehicle began to misfire.

I receivd a recall on my 2021 GMC Denali 1500 , 6.2 engine Recall # N252494000. made an appointment with Carroll GMC, at 1455S. Tamiami Trail, Venice , Fl, on 7/29/25 at 11AM. I showed up for my appointment and they denied checking my truck on the recall stating they did not have the remedy to fix the problem so therefore they were not going to check my truck for the recall...... I have a trip coming up and now I a afraid to go on the highway in case my truck loses power and I get in an accident............ MY truck should have been checked for the recall regardless of the remedy to fix it..So at least I know weather it is safe to drive or not

I have owned 4 of these trucks in my lifetime ranging from 2007-2015 all equipped with the same drivetrain. 5.3l engine and 6l80 transmissions. All have had the same failures. The engine afm system particularly the lifters fail which in turn destroys the camshaft and destroys the engine. More importantly the transmission torque converter fails sending debris through the whole system causing a sudden loss of drive. This happened while driving down the road and was a safety concern for myself and others. This time it costed me $6500 to replace the transmission. All of the trucks I have owned experianced the same failures how is this not a problem?

On August 11, 2025, at about 2:52pm, my vehicle was at a complete stop at an intersection awaiting the traffic light to turn green. There was a slight downgrade slope towards the intersection. The vehicle one-pedal driving was enabled. Weather was sunny with no wind or rain. Suddenly, the vehicle started vibrating violently and started rolling into the intersection. I pressed on the brake pedal but the vehicle continued to vibrate and the vehicle rolled into the middle of the adjoining lane of traffic. There was no traffic on the roadway and no other vehicles were affected. My vehicle had come to a compete stop in the roadway and I attempted to accelerate through the intersection but the vehicle would not move. I recycled the power to the vehicle and placed the vehicle into drive and proceeded to drive through the intersection. I do recall that when I was pressing the brake pedal, the vibration felt somewhat similar to vibration of the ABS brake system when the tires are losing traction but the vibration was much more pronounced. I pulled the vehicle onto the side of the road and checked the driver information display. A "Service ESC" notification appeared on the driver information panel followed by "One-Pedal Driving Unavailable Use Brake for Stopping". No other warnings or notifications were observed after this incident and the vehicle seems to be driving normally. I was able to re-enable the one-pedal driving mode the next morning.