P2637 Engine Torque signal malfunction. If you read the diagnostic procedure, it basically has a few steps ultimately leading to a TCM computer. Well, I put a brand new TCM computer from GM in it and it still messes up. I have to drive it for a few days, but i...

FIX posted 4/25/2012

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle