GMC 2001 Envoy - Manual (Page 108)

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D Move the lever up as far as it will go.
3. Turn the ignition key to LOCK.
4. Remove the key and take it with you. If you can
leave your vehicle with the key, your vehicle is
in PARK (P).
Console Shift Lever
1. Hold the brake pedal down with your right foot and
set the parking brake.
2. Move the shift lever into PARK (P) position like this:
D Hold in the button on the lever.
D Push the lever all the way toward the front of
the vehicle.