Chevrolet 2003 Tahoe Owner's Manual page 126

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Move the lever up as far as it will go.
3. Be sure the transfer case is in a drive gear - not in
4. Turn the ignition key to LOCK.
5. Remove the key and take it with you. If you can
leave
your
vehicle with the ignition key in your
hand, your vehicle is in PARK (P).
NEUTRAL (N).
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.
If you have four-wheel drive and your transfer
case is
in
NEUTRAL, your vehicle will be free
to roll, even if your shift lever is in PARK (P).
So be sure the transfer case is in a drive
gear
--
not in NEUTRAL.
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 unless
you have to.
If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and the
parking brake is firmly set before you leave it. After you
move the shift lever into PARK (P), hold the regular
brake pedal down.
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