GMC Envoy Owner's Manual page 298

Q:
What should I do if my vehicle stalls, or is
about to stall, and I cannot make it up
the hill?
A:
If this happens, there are some things you should
do, and there are some things you must not do.
First, here is what you should do:
•
Push the brake pedal to stop the vehicle and
keep it from rolling backwards. Also, apply
the parking brake.
•
If your engine is still running, shift the transmission to
REVERSE (R), release the parking brake, and slowly
back down the hill in REVERSE (R).
•
If your engine has stopped running, you will need to
restart it. With the brake pedal pressed and the
parking brake still applied, shift the transmission to
PARK (P) and restart the engine. Then, shift to
REVERSE (R), release the parking brake, and slowly
back down the hill as straight as possible in
REVERSE (R).
•
As you are backing down the hill, put your left hand
on the steering wheel at the 12 o'clock position. This
way, you will be able to tell if your wheels are straight
and maneuver as you back down. It is best that you
back down the hill with your wheels straight rather
than in the left or right direction. Turning the wheel
too far to the left or right will increase the possibility
of a rollover.
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