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FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17085
Experience:  Master Automotive Technician
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2005 sierra duramax lost com with tcm. no indicator under

Customer Question

2005 sierra duramax lost com with tcm. no indicator under PRND. Hersruds GMC Dealer in Sturgis SD had it for 6 days replaced TCM, and again same problem 4 day later,spent another 2 days a Shaw GMC in Calgary. I'm at at loss why.
Submitted: 28 days ago.
Category: GMC
Expert:  FIX IT MAN replied 28 days ago.

Hello, my name is***** my experience with this vehicle the issue is usually the ignition switch. I have seen the ignition switch cause a loss of voltage to this system which causes a loss of communication. It can be a problem with the CAN wiring, but that is not nearly as common. They should be able to do a voltage drop test of the ignition switch to verify this.

Customer: replied 23 days ago.
No replaced ignition switch still no start no communication with tcm
Expert:  FIX IT MAN replied 23 days ago.

Thank you. So you are having a no start condition also?

Customer: replied 22 days ago.
No start caused by no communication with tcm