SOURCE: 2005 GMC Envoy Locked in 4WD all the time
If your luck it's going to be a $15.00 vacuum switch on the transfer case that takes about 15 min to replace, if it's the electronic solenoid to the transfer case then it's going to be cost a little more and take a little longer. If your try switching from 4WD to 2WD and hear the solenoid working by hearing the cluck's when it engages and disengage then it's going to be the vacuum switch on top of the transfer case on the drivers side. Auto Zone Sell's them for $15.00 and they will have the step by step instructions to replacing the switch. They will also have the transfer case solenoid too, if you don't hear the solenoid. Check the fuses, the fuse may have gone bad. Good luck and hope this helps.
SOURCE: 2005 GMC Envoy XL 4x4 4.2l PO172 enigne too rich
Well the first mistake you did was not take it to your GMC car dealer and let them check it out. It could be a computer problem inside the dash somewhere. Hope this helps!?
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SOURCE: 04 gmc envoy, 6
Does it engage and then quit immediately? Or does it stay on for a while? Please give me some more details so I can properly diagnose the problem. Thanks!
SOURCE: 2005 GMC ENVOY XL the cruise control do not work
Why not save a lot of money and aggravation,
and just go down the street to a local repair shop?
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