GMC Canyon Owner's Manual page 121

If you need to leave your key in the ignition but not
in LOCK for an extended period, it is recommended
that you disconnect the battery cable from the
battery to prevent discharging your battery.
There are several different positions for your
shift lever.
PARK (P): This position locks your rear wheels.
It is the best position to use when you start your
engine because your vehicle cannot move easily.
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
CAUTION: (Continued)
CAUTION: (Continued)
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 132. If you are
pulling a trailer, see Towing a Trailer
on page 300.
Make sure the shift lever is fully in PARK (P)
before starting the engine. Your vehicle has an
automatic transmission shift lock control system.
You must fully apply your regular brakes before
you can shift from PARK (P) when the ignition key
is in ON. If you cannot shift out of PARK (P),
ease pressure on the shift lever by pushing the
shift lever all the way into PARK (P) as you
maintain brake application. Then move the shift
lever into another gear. See Shifting Out of
Park (P) (Automatic Transmission) on page 134.
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