GMC 2002 Envoy - Manual (Page 95)

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Shift Lock Release
This vehicle is equipped with a shift lock release
system. If your vehicle has a dead battery and you
need to have your vehicle towed, there is a shift lock
release lever that will allow you to move the shift lever
out of PARK (P).
To access the shift lock release lever, do the following:
1. Press on the sides of the boot around the shift lever
to release the boot.
2. Lift up the boot on the shift lever and you will see an
orange lever.
3. Press the orange lever down and move the shift lever
out of PARK (P).
4. Snap the shift lever boot back in place.
Four - Wheel Drive (If Equipped)
If your vehicle has four - wheel drive, you can send your
engine’s driving power to all four wheels for extra
traction. To get the most satisfaction out of four
- wheel
drive, you must be familiar with its operation. Read the
part that follows before using four
- wheel drive. You
should use two - wheel drive (2HI) for most normal
driving conditions.
NOTICE:
Driving in the 4HI or 4LO positions for a long
time on dry or wet pavement could shorten the
life of your vehicle’s drivetrain.