When did I replace my TCM in my GMC Duramax?
When did I replace my TCM in my GMC Duramax? I had my TCM replaced just a couple weeks ago. Mine's an '11. It was starting to freak out a little here and there. Symptoms were rough shifts, wouldn't down shift to 5th from 6th on the freeway when trying to pass, and occasional slipping. It just gave out on me completely on the freeway and locked in 5th gear. Why did my GMC Duramax Transmission Control Module fail? No reason was given for the failure and no way to prevent it. I had my TCM replaced just a couple...