Automatic Transmission Operation - Chevrolet 2009 Impala Owner's Manual

Automatic Transmission Operation

The automatic transmission has a shift lever on the
steering column or on the console between the seats.
There is a display, located on the instrument panel
cluster that will indicate the gear the vehicle is in.
Maximum engine speed is limited on automatic
transmission vehicles while in P (Park) or N (Neutral) to
protect driveline components from improper operation.
There are several different positions for the shift lever.
P (Park): This position locks the front wheels. It is
the best position to use when the engine is started
because the vehicle cannot move easily.
2-24
CAUTION:
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It can be 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. 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, use the steps that follow. If
you are pulling a trailer, see Towing a Trailer on
page 4-28.
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 brakes first, then press the shift lever
button before you can shift from P (Park) while the
ignition is in ON/RUN. If you cannot shift out of P (Park),
ease pressure on the shift lever and push the shift
lever all the way into P (Park) as you maintain brake
application. Then press the shift lever button and move
the shift lever into another gear. See Shifting Out of
Park on page 2-29.