2023 Chevrolet Silverado 2500 Power Train

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.

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.

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.

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?

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.

Truck has less than. 30k miles on it. Went into limp mode, was less than a mile from home. Parked it had it towed to nearest dealer. They then informed me they have 4 other truck sitting and waiting for Gm to fix parts with allison 10 speed transmission valve body. Dealer says it is at least 4 month wait to get my truck back. I work out of this truck for my business, and still have to pay my $1260 truck payment monthly for a truck that I can't use. Then they tell me they cant give me a loaner truck, only a car that i have to pay out of pocket daily for since chevy only covers $44 a day and cheapest rental is at $50 a day. I cant move trailers and equipment with a car. Gm knows there is a problem with these transmissions and won't do anything about it. I bought new thinking I'd be doing okay with extra warranty, but here we are with no real solution. Please help!!!

My truck has 50k miles and while driving down the road heard a loud pop and felt the truck jerk. Then the truck entered low power mode and the engine light turned on. I took it to the dealership and they are contributing it to the transmission valve body. Has been in the shop for 3 week so far and still no update when the part will be available.

While driving my truck it shifts into tow mode by itself, also on june 1st 2025 my truck shifted to 4 low by itself .

Traveling 70mph on parkway, out of nowhere, the RPM start revving like the transmission had shifted into neutral, but it is still in Drive. Managed to get off at next exit allowing the Truck to coast. At stop sign, the Truck slams into first, slams into second, reaches 30mph and begins to do same problem and RPM’s rev like in neutral. Can not get the truck to go over 30mph of change any more gears. We did manage to take a 15 min ride to nearby Chevy Dealer. Dealer has confirmed no codes or check engine lights. After 1 full week in, no further information has been provided except at some point next week, it’s on the schedule to open the transmission. Vehicle is now stuck in Maryland. I did receive a rental to continue my way home that evening to SC.