2024 GMC SIERRA 2500 Complaints

The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving at various speeds, the two outside cabs were smoking. There was smoke detected near the fuel tank. The contact stated that there was an abnormal odor of diesel and DEF detected. There were no warning lights illuminated. The vehicle was taken to the local dealer, but the vehicle was not diagnosed or repaired. While driving, there was a lot of smoke detected from the vehicle. The vehicle was taken back to the local dealer, who was unable to determine the cause of the failure. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 100.

First date was 04/23/2024 my truck went into limp mode with an alert reading engine and transmission control module problem. Brought it in and they reset the sensors. Shortly after the alert warning goes off again and I turn the engine off and start it back up. It cleared the alert, I brought it back in on 06/15/2024. They reset sensor and fixed a recall on tailgate. I picked up truck, drove it for 2 months and TCM warning came up and threw truck into limp mode while pulling a 2 horse trailer. It turned a 3 hr drive into a 6 hr drive. I brought back to dealer on 8/19/2024 they had it for 4 days and they notified me that this is an on going problem. It is a transmission solenoid valve stuck open and they ordered the part and told me it could be months before the part gets here due to the ongoing backorder from all the other trucks that have the same problem. I use this truck for work and leisure to pull my boat and 2 horse trailer and now I have a vehicle payment to make and no vehicle to use. I cannot use it to work or anything else because it is at the dealer for an unspecified amount of time. I have read online that this is a major problem with this truck and GMC as well as the dealerships know about this problem and they still sold it to me. There are so many complaints online about this GMC 2500 AT4 truck problem that GMC should stop selling this truck.

I drove from California to ohio after I bought the truck, I noticed that when stopping to get gas my tailgate was open without me touching it. I drove with cameras showing the truck bed to see what happened and I watched it do it again while driving the vehicle, it just opened on its own while driving. The incident happened again once I was back in ohio when I had my trailor hooked up and it cause the tailgate to collide with the trailor tongue and dented the whole top of the tailgate.3

Transmission and transfer case leaking. Masters cylinder ( brake booster) leaking

I purchased a 2024 GMC 2500 HD truck to pull a 2021 8,000 lb gvw camping trailer that is equipped with electric trailer brakes. My trailer has functioned perfectly related to the trailer brakes with my previous vehicle (2011 Toyota Tundra). With the GMC 2500, at approximately 3000 miles on the vehicle, a “trailer brake disconnected or disabled” and “check trailer wiring” warning began popping up on my information center of the truck. The trailer braking system would not function, though all other functions of the lighting and camera systems to the trailer worked indicating that the wiring and grounding were not an issue with the trailer. The brake system would intermittently return to normal. And then this warning and disconnected condition (i.e. no functioning trailer brakes) would return. This occurred rapidly, and very frequently. GMC has acknowledged a problem with some vehicles with this problem by publishing a TSB that purports to correct this issue (23-NA-149) that recommends replacement of the trailer brake control module (part no. 212327200000019B). I had this repair performed while on a trip in South Dakota away from my home state in Arkansas and the truck and trailer functioned as normal for approximately 3000 miles of towing. However, the issue has returned and my local GMC dealer repair shop (Little Rock, AR) places the blame on the trailer and not the truck. Towing with this 2024 GMC 2500 HD is very unsafe to the occupants and any others on the road due to loss of braking while towing a heavy load or navigating steep grades with a trailer equipped as described. This problem is now all over GMC/Chevy truck forums and is not just me or my combination. This issue is gonna get people killed.

The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed, the vehicle briefly hesitated before returning to normal functionality. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the transfer case seals. The vehicle was repaired, but the failure reoccurred. The vehicle was taken back to the dealer, who again diagnosed a failure with the transfer case seals. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 6,000.

Brake control module disconnects trailer brakes while towing. Apparently a known issue with trailers equipped with solar battery chargers which have higher charge than vehicle battery. It feeds back into the trailer brake power module causing it to shut down. The vehicle has an integrated trailer brake controller as it is specifically designed with primary function as a tow vehicle. Shutting down the integrated trailer brake controller results in loss of trailer brakes. Not having trailer brakes is critically dangerous. GM has issued a TSB #23-NA-149 specifically addressing this known defect. Unfortunately, GM refuses to authorize its service technicians to replace the defective brake controller unless they experience the defect personally - the policy is to disbelieve the customer with the defective vehicle. Effectively, this requires providing the trailer to the service tech to drive around until the brakes fail, thus creating another dangerous situation for a tech who may or may not have experience driving vehicles over 50’ in length. Thus, it would appear the best remedy is to enforce a recall to replace the defective brake controller before someone is harm by loss of brakes, since GM requires its techs to encounter a loss of brakes before authorization of replacement of the known defective unit. This happened over 25 times during a trip last week. This fact situation reveals why your Administration actually exists - to protect the public from harm.

The tailgate was automatically dropped while trailer was connected. Destroyed my tailgate. This should never happen.

The contact owns a 2024 GMC Sierra 2500. The contact stated while driving approximately 45–50 MPH in the rain, the tail gate opened unintendedly. There were no warning lights illuminated. The contact stated that cargo in the bed of the truck fell out onto the roadway. The contact stated that the failure was like NHTSA Campaign Number: 24V060000 (Latches/Locks/Linkages) however, the VIN was not included. The vehicle was taken to the local dealer but was not diagnosed or repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 2,900.

The contact owns a 2024 GMC Sierra 2500. The contact stated while driving at an undisclosed speed, the sun struck the solar panel used to charge the battery, and the surge from the battery entered the pigtail going through the truck, and disconnected the brake module, causing it to become disengaged from the vehicle. The contact took the vehicle to the camper and vehicle dealer who both stated there was no issue for concern. The vehicle was not repaired. The manufacturer of the camper and the vehicle were made aware of the issue. The vehicle failure mileage was 8,000.