Q: button on gear shift will not engage to put car in gear on 2002 GMC Envoy

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Yesterday I went to leave, started up the car and it would not go into reverse. The button on the gear shift would not push in at all.
(2) Answers
I am having the SAME problem with my 2006 Envoy. Dealerships (2 of them....) can't find ANYTHING wrong!
Has anyone spilled coffee or soda on to the center console? It is not uncommon for the residue from spilled drinks to cause the sifter to become sticky. If this is the case removing the shifter and washing it with hot water and then drying it completely may take care of the shifter problem with your 2002 GMC Envoy.