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Transmission overheat trouble

I had the TCM tested and updated about a month ago. Here are the tech notes from UpFix.com
  • Tech Note: TESTED AND NO ISSUES FOUND We have reserviced this unit by checking, replacing and reinstalling some internal components as well as reprogramming to latest firmware version. Unit is communicating properly.
I’d hate to buy a TCM and that not fix my problem. After all it was tested and passed as a functioning unit. I'd really like to know what exactly controls the gauge and how the trans warning gets turned on.
 
I pulled the gray data 2 wire from the back of the IPC connector. I checked continuity to the TCM. I got continuity end to end and no continuity to ground. I will continue checking wiring but have ordered a TCM today.
 
Well, I am very happy to say, my 2003 Duramax is back on the road and running great again. After all the trouble shooting, wire chasing, and modules be being sent in for testing, I followed my gut and replaced the TCM. Although I sent it was sent in twice and was so called tested and repaired, I put a new one in today and bingo……the planets aligned and everything is works perfect….. thanks for all of your inputs and support.
 
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