Pontiac 2003 Montana Owner's Manual page 146

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 ignition key in your
hgnd, yx!r l'nhk!e is i n PP.!?K (P).
Leaving Your Vehicle With the Engine
Running
It can be dangerous to leave your vehicle with
the engine running. Your vehicle could move
suddenly if the shift lever is not fully
in
PARK
(P)
with the parking brake firmly set.
And, if you leave the vehicle with the engine
running, it could overheat and even catch fire.
You
or
others could be injured. Don't leave
your vehicle with the engine running.
If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and your
parking brake is firmly set before you leave it. After
you've moved the shift lever into PARK (P), hold
the regular brake pedal down. Then, see if you can
move the shift lever away from PARK (P) without first
pulling it toward you. If you can, it means that the
shift lever wasn't fully locked into PARK (P).
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