TCCM issue?

Frankd1

Well-Known Member
My wife started the truck just now and saw the service 4wd light on the instrument panel. Also noticed no lights above the selector switch.
I had her shut the truck down and rotate the selector a number of times left and right.
Restart and service 4wd is still there and still no lights above selector.

Does this sound like a bad TCCM or no communication to the module.
I was gonna start with pulling the circuit breaker and see if I can wake it up....

Any other things to check or suggestions?

Never had this issue before so it's a new one to me.

2003 envoy sle 154,000 miles
 

Eric04

Silver Supporter
It's possible. Also possible that your selector switch flaked out. I had two random incidences of the service 4wd light coming on this summer but exercising the switch seemed to finally keep the light off. Bought a new switch anyway. You may have already found this thread but in case not it pretty well covers everything:

 
OP
OP
F

Frankd1

Well-Known Member
Thanks Eric I read through all of that, good info!

I went back to the truck and cycled the selector back and forth then started the engine. Service 4wd light was gone and all selections operated normally...been good since.
Hopefully just an intermittent isolated glitch lol
 

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