GMC 2006 Sierra - Manual (Page 121)

{ CAUTION:
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 Transmission)
on page 2-53. If you are pulling a trailer, see
Towing a Trailer on page 4-67.
{ CAUTION:
If you have four-wheel drive, your vehicle will
be free to roll — even if your shift lever is in
PARK (P) — if your transfer case is in
NEUTRAL. So, be sure the transfer case is
in a drive gear, two-wheel high (2H) or
four-wheel high (4H) or four-wheel
low (4L) — not in NEUTRAL. See Shifting
Into Park (P) (Automatic Transmission) on
page 2-53.
REVERSE (R): Use this gear to back up. If your vehicle
has the Allison Transmission
® , the R on the shift display,
may blink if the shift inhibitor is active.
Notice: Shifting to REVERSE (R) while your vehicle
is moving forward could damage the transmission.
The repairs would not be covered by your warranty.
Shift to REVERSE (R) only after your vehicle is
stopped.
To rock your vehicle back and forth to get out of snow,
ice, or sand without damaging your transmission, see If
Your Vehicle is Stuck in Sand, Mud, Ice or Snow on
page 4-46.
2-27