One problem related to transmission not go into gear has been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
I have a 2005 GMC Envoy. I am having problems with my shift lever; it goes in park and stays there for about three minutes before it releases the key (to be taken out of the ignition). When I start the truck, it will not go into any gear for about three minutes, then I hear a click which then release the shift so it can be moved into another gear. It began about two months ago and has gotten worst over time. Once in any gear accept park it can be shifted to another gear without any strain. The consequence of this problem is not being able to get out the vehicle with my key once in park until after the lever cable "snaps in place. " I have not been able to do much of anything about it thus far due to financial difficulties.