2023 Chevrolet Silverado 2500

The contact owns a 2023 Chevrolet Silverado 2500. The contact stated that while driving at various speeds, the transmission was slipping. Additionally, the contact stated that while driving 60-70 MPH, the vehicle stalled. No warning light was illuminated. The contact pulled over to the side of the road. Upon inspection, the contact became aware of a coolant leak underneath the vehicle. The vehicle was towed to the dealer, where it was diagnosed that the turbo coolant inlet had fractured. The part was replaced. Additionally, the dealer determined that the transmission was in working order upon inspection; however, the failure persisted. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 83,000.

The contact owns a 2023 Chevrolet Silverado 2500. The contact stated that while driving at various speeds, the transmission was slipping. No warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was repaired; however, the failure recurred days later. The vehicle was taken back to the dealer, where it was lifted and inspected, and the contact was informed that no failure was found. The contact stated that the failure persisted. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 105,000.

When putting vehicle in park, I get a message on dash that says "shift to park" when the vehicle is already in park. The vehicle electrical components does not turn off. Sometimes if I wiggle/hit or stick my hand under the steering wheel adjustment lever I can get it to turn off. Becoming more troublesome. Through research I see it is a common issue among GM/Chevy vehicles.

Will pulling camper, truck lurched with hard shift at around 35mph and caused a sudden slow down in traffic. Truck then went into limp mode with engine light illuminated. Pulled over to turn vehicle off and restart. Attempted to gain speed again and similar lurch with hard shift at around 35-40mph. Vehicle again in reduced power mode. Was able to ease truck to dealer where code reader showed P0700 and P0747. This was similar to issue found in recall for model years 2020-2022 with GM 10L1000 transmissions. There has been a technical service bulletin issue by GM regarding models years 21-25 but no recall. Dealer has ordered parts for TSB but repair not performed yet.

While driving, the 10l1000 transmission in the truck attempted to shift from 6th gear to 7th gear. The transmission locked up causing a violent "buck" from the rear end of the truck. The road was icy and could have caused the truck to lose control due to the lock up of the rear wheels. After getting the truck to a repair shop, valve body was deemed the cause of the failure. A complete transmission replacement is needed. Had I lost control of the vehicle due to the lock up, my family and other motorists would have been put at risk of severe injury or worse. No warning lights were illuminated prior to failure.

tramsmission valve body failed causing lack of porpulsion and inability to put the pickup in park while in traffic. after coasting to the nearest chevy dealer they cleared the codes so i could drive home and take it to my local chevy dealer asap. the local chevy dealer refused to inspect it until the check engine light came back. one week later the transmission violentley down shifted into 5th gear and stayed there until it was shut off it would not go into park. on the second occurances it gave codes p0700 and p0747. it was towed to the local chevy dealer who claimed to inspect on 3 ocassions but efused to give me any paper work on the results of the inspection. beacuse they never inspected it. i took it to an indepent mechanic to replace the valve body. the 5000 miles since the valve body replacement have been uneventful. no indicators of failure were seen before the inital failure.

While driving to work one day I came to an intersection and stopped. When I went to accelerate to take off my truck shuttered and made a loud noise. The truck immediately went into "Reduced Power Mode" with no warning. I could no longer drive the appropriate speed limit and had to constantly pull over to allow other vehicles to go by. This caused a traffic jam on narrow roads to get the vehicle to a safe spot. My truck only has 43,000 miles on it. The dealership confirmed that the truck has a bad valve body and needs to be replaced. The truck is currently sitting at the dealership and has been since May 15, 2025. As of today, July 18, 2025, GM still does not have an ETA on when the part to fix my truck will ship out.

Sudden jerk power train and deceleration while driving and towing 5th wheel, immediate loss of power and could have been catastrophic. GM has a known defect that requires immediate attention and investigation to affirm this is a broad national problem with the Allison 10 speed 10L1000 transmission, specifically the defective transmission control valve body assembly. Do we have to wait for multiple family members to be killed or seriously injured due to this known defect? Time for action and resolution. My local dealer tells me this is bigger than anyone knows... why?