Where is the TCM located? Van has the 4.3L Vortec engine. Van shifts rough.
What is your question?
After vehicle warms up, it shifts rough when it does shift. I've reset the TCM following set procedures. I have a FIXD Installed and have reset the faults a few times. I need to alleviate the problem as inexpensive as possible.
What makes this problem better or worse?
It's worse at higher speeds when engine is warmed up
How long has your 2021 Chevrolet Express 2500 had this problem?
RepairPal Certified shops can diagnose and repair your 2021 Chevrolet Express 2500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, Dave here, contributing to RepairPal and providing expert advice since 2010.
You mention having a scanner installed - what are the faults that have been set?
Why are you looking for the TCM?
Codes set are going to give you tips for troubleshooting.
Going around the process of figuring out what is wrong and instead trying to act to do the most inexpensive thing to fix your vehicle - may be a desire but probably will not yield the results you're hoping for.
I believe you likely have a internal electrical or mechanical transmission concern that will require more advanced troubleshooting to resolve.
Reach out to a shop near you for help.
https://repairpal.com/auto-repair-near-me
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