Cadillac 2004 DeVille Owner's Manual page 94

Column Shifter (Digital and Analog Cluster similar)
PARK (P): This position locks the front wheels. It is the
best position to use when you start the engine
because your vehicle cannot move easily.
2-30
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 4-39.