I'm linking a YouTube video of a transmission/transfer case removal from a GM rwd/awd/4wd vehicle. The exact steps may not be the same for your Envoy, but you will get a general idea of what is involved. If you want step by step instructions, get a repair manual (Haynes, Chilton, Motor, etc) from your local auto parts store. How To Remove Transmission Transfer Case From GMC Sonoma Chevy 10 Blazer...
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: i have a 2005 gmc envoy and the driver seat gets hot
There may be a stuck relay Stuck in the "On" position. A relay is a remote switch that does the heavier work of a smaller or more delicate switch. It is probably under the seat but if you have "memory" seats that move the power seats back and forth it is probably the control box causing the problem. It has relays inside it.
SOURCE: My 2002 GMC Envoy transmission slips into neutral
try adding fluid and if still slipping neeed to have it checked could just need a fluid change
SOURCE: I have 2005 GMC Envoy. I noticed the gas
The new design filler neck on newer gm vehicles don't have a flap. The flap was just to keep stuff from falling in. I've had problems with the fuel sending unit in the tank on these vehicles.
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