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2002 gmc envoy_slt
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Discussion Starter · #1 ·
A while ago the lights on my 4wd went off and would not come on no matter what selection I was in.
I'm getting no service 4wd light on the dash, no clunk whenever I switch to 2 or 4wd, nothing.
I've already read up a little and pulled and check fuse #8 and also disconnected and reconnected my battery.
I'm guessing that the TCCM is to blame but I was just needing a little conformation as well as a little how to on how I go about replacing the TCCM.

Any help is much appreciated.
 

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2004 gmc envoy_slt
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2,608 Posts
The 2002 model year is known for flaky TCCMs. See if you can pick up one at a salvage yard, but make sure to get one from a 2003 and up model (and only one from a Trailblazer or Envoy)

The TCCM is located up in the dash to the left of the steering column, it is a small box maybe 3 x 5.
 
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