Restore Peak Transmission Performance in Your GM Truck
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with the 10-speed Allison. The complaint was severe, intermittent shift flares between 3rd and 4th gear and a persistent U0101 code. The dealership had quoted him over $1,200 for a new module plus programming and a two-day wait. He was a contractor who couldn’t afford the downtime. We confirmed the TCM was the culprit after checking the network wiring. With this pre-programmed module, he was able to perform the swap himself in his driveway in under an hour. The truck was back on the road the next day, shifting perfectly, for a fraction of the cost and zero downtime. This is the exact solution we provide—a direct, effective fix that respects your time and budget.