Question about 2003 GMC Envoy
If the transfer case actuator is working correctly, the only other possibility is the front disconnect mechanism. If this part of the 4WD system is not engaging then the Transfer Case Control Module (TCCM) will not allow the system to go into AWD or 4WD. Do yourself a favor and find a mechanic who knows GM 4WD systems.
BTW, operating the truck in AWD is not good for the drivetrain, if you need additional traction, switch to 4WD.
Posted on Dec 16, 2012
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Posted on Jan 02, 2017
SOURCE: My 2006 GMC Envoy Denali
TRY PUTTING THE TRANSMISSION INTO NEUTRAL, I HAD THE SAME EXACT PROBLEM, UNTIL I CALLED A MECHANIC FRIEND OF MINE. I COULDN'T BELIEVE HOW WELL IT WORKED.....CHECK IT OUT.
Posted on Apr 17, 2009
Have you been thru a car wash lately?
There is a sensor in the trans that senses what gear mode you're in...it either is working or it isn't....
are you still under warranty??
Posted on Jun 03, 2009
I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.
Posted on Sep 18, 2009
SOURCE: I have a 2003 Yukon
My 2003 yukon xl does the exact same thing. Sorry that I do not have a solution, but I figure its the same reason the daytime running lights always burn-out. The SUV in general has be an absolute POS and I will never buy another.
Posted on Nov 11, 2009
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