GMC 2001 Envoy - Manual (Page 109)

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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).
For models with the tow/haul switch mounted on the
shift lever, use the following procedure to shift your
vehicle into PARK (P):
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 front of the lever.
D Push the lever all the way toward the front of
the vehicle.
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).