Chevrolet Impala 2007 Owner's Manual page 117

CAUTION:
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It can be 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. 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,
use the steps that follow. If you are
pulling a trailer, see Towing a Trailer on
page 284.
Make sure the shift lever is fully in PARK (P)
before starting the engine. Your vehicle has an
automatic transaxle shift lock control system.
You must fully apply your regular brakes first
and then press the shift lever button before you
can shift from PARK (P) while the ignition is
in RUN. If you cannot shift out of PARK (P), ease
pressure on the shift lever and push the shift
lever all the way into PARK (P) as you maintain
brake application. Then press the shift lever button
and move the shift lever into another gear.
See Shifting Out of Park (P) on page 123.
REVERSE (R): Use this gear to back up.
Notice: Shifting to REVERSE (R) while your
vehicle is moving forward could damage
the transaxle. The repairs would not be
covered by your warranty. Shift to
REVERSE (R) only after your vehicle
is stopped.
To rock your vehicle back and forth to get out of
snow, ice, or sand without damaging your
transaxle, see If Your Vehicle is Stuck in Sand,
Mud, Ice, or Snow on page 276.
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