2024 GMC Sierra 1500: transmission slipping

Filed Aug 11, 2026 · Transmission · MI

transmission shift hard and slipping. When step on gas to go faster transmission shifts really hard like going drop on ground. Sometimes wont shift at all only goes up to 69 till left off gas and then transmission will shift. Start happening with about 10000 miles on truck and GMC said this is normal. Now need a torque converter and shift module in it.

Filed Jul 2, 2026 · Driver assistance, Engine · MA

The vehicle suffers from a persistent transmission defect including shuttering bucking slipping torque converter failure valve body failure twice metal debris improper down shifting chirping noises and related liability and safety issues. The vehicle has undergone multiple unsuccessful repair attempts at authorise GM dealerships. These repairs include torque converter replacement valve body replacement twice solenoid replacement fluid services software updates. The transmission problems have persisted despite these efforts and the vehicle has been out of service for more than 22 business days including a breakdown driving to Florida. I have filed a claim through GM but it seems like it just keeps getting pushed further and further away this is a serious safety issue as I fear for those driving around me and myself that I may cause an accident with the bucking slipping and failure to operate properly on the road.

Filed May 20, 2026 · Electrical, Transmission · NH

Check engine light illuminated with service transmission. The next day transmission started slipping and finally would not engage in reverse. Dealership Has it now and after diagnosis they advised that they had replaced the electronic control module to which, on the test drive, the gauge cluster blacked out and they got more codes. The cpdes that the vehical threw were the transmission valve body needed to be replaced.The truck has 24k miles on it.

Filed Mar 4, 2026 · Transmission · 3,000 miles · ID

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered and hesitated, and the transmission was slipping. No warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed, and DTC: P2818 “Pressure Control Solenoid H was stuck and the Transmission Control Module (TCM) valve body”. The contact was informed that the part needed to be replaced. The dealer informed the contact to stop driving the vehicle. The vehicle was repaired. The contact stated that months later, the failure reoccurred while driving at an undisclosed speed, and the vehicle shuddered and hesitated, and the transmission started slipping. The vehicle was taken back to the dealer, where it was diagnosed and determined that the torque converter needed to be replaced. The vehicle was repaired, but three months later, the failure reoccurred, and the RPM started fluctuating. The contact called the dealer; however, the vehicle was not inspected or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 3,000.

Filed Jan 9, 2026 · Engine, Transmission · GA

While traveling down the highway at approximately 60-65mph I pressed the accelerator to change lanes and pass a tractor trailer when it felt like my transmission slipped very abruptly. There was a very noticeable power loss and the truck would not accelerate. Then I noticed a loud knocking noise coming from the engine. No check engine light or any other indications on the dash to let me know there was a problem. I began to try and merge to the right of the highway to get off which was not easy do to the power loss and heavy traffic on the highway at the time. I made it to the right lane to exit the highway and when I slowed down the engine died and I had to coast to a stop luckily on an exit ramp. The truck was towed to a dealership and they state that I will need a new engine. I know this issue is already well documented with the GM 6.2l engines but I is very unsettling that the engine just died on the highway at highway speeds and no indications.

Filed May 1, 2025 · Electrical, Engine · KY

Purchase the truck [XXX]. In January of 2025 it started to feel like the engine was slipping. Near the end of February, it was getting worse and the locks started locking/unlocking on their own. The vehicle stalled two separate times while driving on a main road. The first couple days of March, the car stalled, again on the road while the locks went crazy. Then, on [XXX], after I had pulled out of my driveway in my neighborhood, my car completely shut down. We had to have the truck towed to Coyle GMC, in Clarksville, Indiana. And, as of May 1st, it is still there. We have been told they need some cap for the transmission and they don't know when they will get it. They offered to give us a new transmission, but they don't know when they'll get it. I am making car payments on a car that I have not had since May 7th. Unfortunately, because I drive my car for work, it had it's 32000 miles on it, so I can't turn it in for the lemon law. I'm very lucky that my son and I were not injured when the car stalled in the middle of the road. This is an ongoing issue with GMC, and I think it should be illegal that they were selling these trucks. I have a brand new truck that I haven't driven in 2 months. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)