2025 GMC SIERRA 3500

The truck automatically engages the parking brake ONLY when on an incline, never at any other time. I am so used to engaging the parking brake at all other times I also engage it when on an incline. The problem is the truck DISENGAGES the brake automatically after I've engaged it. This has happened multiple times when I've been towing a large boat on a launch ramp or towing my heavy 5th wheel. I can be fully exited from the truck and 10 ft away when it disengages and I watch it lurch forward

Oil cooler for truck is defective and thus allowed all oil to be mixed with the coolant. GM is stating they will flush engine and replace with exact same part. Very common issue and sad to have a $100k truck and it is junk.

Picked up vehicle from Dealership new, with 12miles on the odometer. During the trip home (over 150+ miles each way) and at 54 miles a "Forward Collision System Unavailable" warning message appeared on the dash. Stopped for coffee and restarted the vehicle and the error cleared. It re-appeared at 235 miles, and again at 427 miles along with an OBD error P0700 @cycle#763, Occurrence Cycle #2608. Returned the Vehicle to the dealership service department for repairs. The vehicle was returned and w

“I own a 2025 GMC Sierra with 30,000 miles. The oil cooler failed and caused loss of oil pressure and potential internal engine damage. The dealership acknowledges the failure but refuses to escalate the case or perform a proper inspection. I am being instructed to continue driving the truck even though it may suffer catastrophic failure while driving. This is a safety hazard.”

The integrated wirless phone charger when charging my phone always the phone to get very hot and puts my phone into overheating protcol. The safety concern is that this charger could overheat my phones battery and cause a fire with in the cab of the vehicle. This could cause an imminent threat to the safety of all persons in the vehicle. The issue was reproduced to the dealer that does my regular service. The component has not been inspected by the manufacturer. There is no warning signs produc

weekly you will start the truck and have no audio of any kind. No blinker noises no collision warning noises, no radio, no on star noise. No sound at all and sound will never come back on until you turn truck off and wait 20 mins. GMC says it's a known software issue, but this has been going on since I bought the truck brand new back is April of 2025. I live in a hands free while driving state when it's come to cell phone use and can't even take a call with no audio of any kind. I don't see how

weekly you will start the truck and have no audio of any kind. No blinker noises no collision warning noises, no radio, no on star noise. No sound at all and sound will never come back on until you turn truck off and wait 20 mins. GMC says it's a known software issue, but this has been going on since I bought the truck brand new back is April of 2025. I live in a hands free while driving state when it's come to cell phone use and can't even take a call with no audio of any kind. I don't see how

weekly you will start the truck and have no audio of any kind. No blinker noises no collision warning noises, no radio, no on star noise. No sound at all and sound will never come back on until you turn truck off and wait 20 mins. GMC says it's a known software issue, but this has been going on since I bought the truck brand new back is April of 2025. I live in a hands free while driving state when it's come to cell phone use and can't even take a call with no audio of any kind. I don't see how

Hose from power steering pump came off causing truck to loose power steering and brakes. Fortunately we had just exited the interstate and were in a parking lot when this occurred. Truck was towed 90 miles to dealer who confirmed that hose was incorrectly installed by factory

Hose from power steering pump came off causing truck to loose power steering and brakes. Fortunately we had just exited the interstate and were in a parking lot when this occurred. Truck was towed 90 miles to dealer who confirmed that hose was incorrectly installed by factory

While towing my fifth wheel trailer, the truck intermittently disconnects the trailer brakes while in motion. This results in a sudden loss of roughly 75% of my braking capability, creating an extremely dangerous situation. I have a professional driving background, which has helped me avoid an accident so far, but this issue could easily result in a collision, especially under emergency braking or downhill conditions Service Attempt: On June 17, 2025, I brought the vehicle to Madras Chevrolet i

I am reporting a potentially serious and widespread safety defect involving Goodyear Wrangler TrailRunner AT tires installed as factory equipment on General Motors trucks. My 2025 GMC Sierra 3500HD Denali has just 5,800 miles. Both rear tires, with DOT code 2724, have developed identical sidewall bulges behind the “NER” in the “TrailRunner” stamp. These bulges are consistent with internal structural failure, not road hazard damage. The truck has never struck a pothole or curb, and there

Tail gate has opened twice while driving down the road.

Intermittent loss of trailer brake function. While traveling and towing a RV trailer with electric brakes, receive a dashboard alert that trailer brakes have been disconnected. This has occurred since vehicle was new. Trailer brake system has been inspected and trailer is not the issue. Took truck to GMC dealer. They are well aware of common issue with GMC owners. GMC issued a safety bulletin 6+ months ago to dealers to replace the integrated trailer brake controller (RPO code JL1). Per reports

Intermittent loss of trailer brake function. While traveling and towing a RV trailer with electric brakes, receive a dashboard alert that trailer brakes have been disconnected. This has occurred since vehicle was new. Trailer brake system has been inspected and trailer is not the issue. Took truck to GMC dealer. They are well aware of common issue with GMC owners. GMC issued a safety bulletin 6+ months ago to dealers to replace the integrated trailer brake controller (RPO code JL1). Per reports