Cadillac 2009 CTS Owner's Manual page 115

Automatic Transmission Operation
The shift lever is located on the center console between
the front seats.
P (Park): This position locks the rear wheels. It is the
best position to use when you start the engine because
the vehicle cannot move easily.
There are several different
positions for the shift lever.
CAUTION:
{
It is dangerous to get out of the vehicle if the shift
lever is not fully in P (Park) with the parking brake
firmly set. The vehicle can roll.
Do not leave the 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 the
vehicle will not move, even when you are on fairly
level ground, always set the parking brake and
move the shift lever to P (Park). See Shifting Into
Park (Automatic Transmission) on page 2-48.
If you are pulling a trailer, see Towing a Trailer
(CTS-V) on page 4-29 or Towing a Trailer (CTS)
on page 4-29.
Make sure the shift lever is fully in P (Park) before
starting the engine. The vehicle has an automatic
transmission shift lock control system. You must
fully apply the regular brakes first and then press
the shift lever button before you can shift from
P (Park) when the ignition key is in ON/RUN.
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