Automatic Transmission Operation - GMC 2003 Sierra 1500 Pickup Owner's Manual

Automatic Transmission Operation
If your vehicle is equipped with an automatic
transmission, it features an electronic shift position
indicator within the instrument panel cluster. This display
must be powered anytime the shift lever is capable of
being moved out of PARK (P). See Fuses
and
Circuit Breakers on page 5-
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1.
There are several different positions for your shift lever.
PARK (P): This position locks your rear wheels. It's
the best position to use when you start your engine
because your vehicle can't move easily. If your vehicle
is equipped with the Allison@ Transmission, use park
for stationary operation of the Power Takeoff (PTO) (if
equipped).
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dangerous to get ou f your
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shift lever is not fully in PARK (P) with the
parking brake firmly set. Your vehicle can
roll.
Don't 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 won't move, even when
you're on fairly level ground, always set your
parking brake and move the shift lever to
PARK (P). See "Shifting Into Park (P)" in the
Index. If you're pulling a trailer, see "Towing a
Trailer" in the Index.
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