Pontiac 2007 G5 Owner's Manual page 114

You have to fully apply your regular brakes first
and then press the shift lever button 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 and push the shift
lever all the way into PARK (P) as you maintain
brake application. Then press the shift lever button
and then move the shift lever into another gear.
See Shifting Out of Park (P) (Automatic Transaxle)
on page 121.
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 248.
NEUTRAL (N): In this position, your engine does
not connect with the wheels. To restart when
you are already moving, use NEUTRAL (N) only.
Also, use NEUTRAL (N) when your vehicle is
being towed.
114
CAUTION:
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Shifting into a drive gear while your engine
is running at high speed is dangerous.
Unless your foot is firmly on the brake
pedal, your vehicle could move very
rapidly. You could lose control and hit
people or objects. Do not shift into a drive
gear while your engine is running at high
speed.
Notice: Shifting out of PARK (P) or
NEUTRAL (N) while the engine is running at
high speed may damage the transaxle.
The repairs would not be covered by your
warranty. Be sure the engine is not running at
high speeds when shifting your vehicle.