Chevrolet 2006 HHR Owner's Manual page 104

Automatic Transaxle Operation
If your vehicle is equipped with an automatic transaxle,
the shift lever is located on the console between
the seats.
PARK (P): This position locks your front wheels. It is
the best position to use when you start your engine
because your vehicle cannot move easily.
2-26
There are several different
positions for the automatic
transaxle.
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) (Automatic Transaxle)
on page 2-31. If you are pulling a trailer, see
Towing a Trailer (Manual Transaxle) on
page 4-39 or Towing a Trailer (Automatic
Transaxle) on page 4-39.