GMC 2010 Canyon Crew Cab Owner's Manual page 145

WARNING: (Continued)
Monoxide (CO) which cannot be seen or smelled.
It can cause unconsciousness and even death.
Never run the engine in an enclosed area that has
no fresh air ventilation. For more information,
see Engine Exhaust on page 3-34.
WARNING:
{
It can be dangerous to get out of the vehicle if
the automatic transmission 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 it
is on fairly level ground, always set the parking
brake and move the automatic transmission shift
lever to P (Park), or the manual transmission shift
lever to Neutral.
WARNING:
{
Four-wheel drive vehicles with the transfer case
in N (Neutral) will allow the vehicle to roll, even if
the automatic transmission shift lever is in
P (Park). So, be sure the transfer case is in a
drive gear — not in N (Neutral). Always set the
parking brake.
Follow the proper steps to be sure the vehicle will not
move. See Shifting Into Park (Automatic Transmission)
on page 3-31.
If pulling a trailer, see Towing a Trailer on page 5-48.
3-35