Automatic Transmission Control Module problems of the 2021 Chevrolet Silverado 1500

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that the transmission shifted hard while depressing the accelerator pedal. There was no warning light illuminated. The vehicle was taken to the dealer and the tcm was reprogrammed; however, the failure worsened, and the vehicle hesitated while depressing the accelerator pedal. Upon investigation, the contact discovered NHTSA campaign number: 24v797000 (power train) and linked the failure to the recall. The vehicle was taken back to the dealer and the contact was informed that the vehicle was not under recall. The contact was referred to the NHTSA hotline to report the failure. The vehicle was not repaired. The manufacturer was notified of the failure and a case was filed. The failure mileage was approximately 120,000.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving from a complete stop, the transmission was slipping between third and fourth gears. The contact stated that the failure recurred while driving between the sixth and seventh gears. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the transmission had failed due to the tcm and torque converter failure; however, the parts were not available to repair the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure and a case was filed. The failure mileage was approximately 95,000.

Repair & breakdown timeline – 2021 chevy silverado owner: [xxx] and [xxx] VIN [xxx] warranty: extended vehicle warranty (active) millenium ________________________________________ ?? repair history summary oct 2024 – issue: hard shifting; gm recall for purge pump – action taken: purge pump replaced under recall – status: returned to owner Nov 19, 2024 – issue: continued shifting problems – action taken: transmission replaced – status: vehicle kept until Feb 2025 Feb 12, 2025 – issue: vehicle returned to owner – action taken: gm reimbursed car payments during downtime – status: returned to owner April 2025 – issue: loss of power; wouldn’t shift past 15 mph – action taken: generic transmission code cleared, no fix – status: returned with unresolved issue June 9, 2025 – issue: random downshifting; rpm/speedometer erratic – action taken: external tcm wire replaced – status: returned June 11 June 18, 2025 – issue: recurring downshifting issue – action taken: internal tcm wire replaced – status: returned June 25 June 27, 2025 – issue: hard downshifting, braking sensation during acceleration – action taken: returned to shop – status: ongoing •7 total repair visits, 4 of them since February 2025 transmission replacement •symptoms continue despite following gm’s repair instructions •dealership has followed gm repair guidance each time •vehicle remains a safety risk, especially with children onboard •similar silverado models have recalls, but this VIN is not include I have two young children, and this vehicle has now placed us in extremely unsafe situations multiple times. We’ve been stranded in traffic, unable to accelerate, and fearful for our safety. Despite repair after repair, the problem continues. At this point, I do not believe this truck can be fixed, and I am unwilling to keep driving it—or trade it in knowing another family could end up in the same dangerous situation. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).