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FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17468
Experience:  Master Automotive Technician
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Replaced tccm on 2002 envoy but no lights are on for the 4wd

Customer Question

Replaced tccm on 2002 envoy but no lights are on for the 4wd selector switch
JA: Just to clarify, what are the exact lights you're talking about?
Customer: The selector switch for 4wheel drive.
JA: Are you fixing your Envoy yourself? What have you tried so far?
Customer: Yes.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I have replaced the selector switch, along with motor.
Submitted: 9 months ago.
Category: GMC
Expert:  FIX IT MAN replied 9 months ago.

Hello, my name is***** this occurring before replacing the TCCM?

Customer: replied 9 months ago.
Come find out, the TCCM I bought has to be reprogrammed. They come blank when you buy them from the dealership. I was getting a C0327 error code when switching from 2 wheel to 4 wheel.
Expert:  FIX IT MAN replied 9 months ago.

That is correct. They are not plug an play. Did you get it programmed?