Chevrolet 2004 Blazer Owner's Manual page 90

PARK (P): This position locks your rear wheels. It's the
best position to use when you start your engine
because your vehicle can't move easily.
CAUTION:
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It is dangerous to get out of your vehicle if the
shift lever is not fully in PARK (P) with the
parking brake firmly set. Your vehicle can roll.
Do not leave your vehicle when the engine is
running unless you have to. If you have left the
engine running, the vehicle can move
suddenly. You or others could be injured. To
be sure your vehicle will not move, even when
you are on fairly level ground, always set your
parking brake and move the shift lever to
PARK (P). See Shifting Into Park (P) on
page 2-36. If you are pulling a trailer, see
Towing a Trailer on page 4-60.
2-24
CAUTION:
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If you have four-wheel drive, your vehicle will
be free to roll — even if your shift lever is in
PARK (P) — if your transfer case is in
NEUTRAL. So, be sure the transfer case is in a
drive gear — not in NEUTRAL. See Four-Wheel
Drive on page 2-29. See Shifting Into Park (P)
on page 2-36.
Ensure the shift lever is fully in PARK (P) before starting
the engine. Your vehicle has an automatic transmission
shift lock control system. You have to fully apply
your regular brakes before you can shift from PARK (P)
when the ignition key is in RUN. If you cannot shift
out of PARK (P), ease pressure on the shift lever; then,
while pressing the button on the console shift lever,
push the shift lever all the way in PARK (P) as
you maintain brake application. Then move the shift
lever into the gear you wish. See Shifting Out of Park (P)
on page 2-39.