Chevrolet 2006 HHR Owner's Manual page 110

Ensure the shift lever is fully in PARK (P) before starting
the engine. Your vehicle has an automatic transaxle 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 — push the shift lever all
the way into PARK (P) and also release the shift lever
button as you maintain brake application. Then move the
shift lever into the gear you wish. Press the shift lever
button before moving the shift lever. See Shifting Out
of Park (P) (Automatic Transaxle) on page 2-35.
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 4-30.
2-28
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.
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.