GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada/Mexico-14632286) - 2021 - CRC - 11/19/20
236
Driving and Operating
Warning (Continued)
.
Before starting the vehicle, unplug the
cord, reattach the cover to the plug,
and securely fasten the cord. Keep the
cord away from any moving parts.
5. Before starting the engine, be sure to
unplug and store the cord.
The length of time the heater should remain
plugged in depends on several factors. Ask a
dealer in the area where you will be parking
the vehicle for the best advice on this.
Retained Accessory Power (RAP)
When the ignition is turned from on to off,
the following features (if equipped) will
continue to function for up to 10 minutes,
or until the driver door is opened. These
features will also work when the ignition is
in RUN or ACC/ACCESSORY:
.
Infotainment System
.
Power Windows (during RAP this
functionality will be lost when any door
is opened)
.
Sunroof (during RAP this functionality will
be lost when any door is opened)
.
Auxiliary Power Outlet
.
Audio System
.
OnStar System
Shifting Into Park
{
Warning
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. With
four-wheel drive, if the transfer case is in
N (Neutral), the vehicle will be free to
roll, even if the shift lever is in P (Park).
Be sure the transfer case is in a drive
gear. If towing a trailer, see
Characteristics and Towing Tips
.
1. Hold the brake pedal down, then set the
parking brake. See
2. Move the shift lever into the P (Park)
position by pulling the shift lever toward
you and moving it up as far as it will go.
3. Be sure the transfer case (if equipped) is
in a drive gear
–
not in N (Neutral).
4. Turn the ignition off. For Key Access,
push the ignition key in, towards the
steering column and then turn the
ignition off.
5. For Key Access, remove the key and take
it with you. If you can leave the vehicle
with the ignition key in your hand, the
vehicle is in P (Park).
For Keyless Access, take the Remote
Keyless Entry (RKE) transmitter with you.
Leaving the Vehicle with the Engine
Running
{
Warning
It can be dangerous to leave the vehicle
with the engine running. The vehicle
could move suddenly if the shift lever is
not fully in P (Park) with the parking
brake firmly set.
If you have four-wheel drive and the
transfer case is in N (Neutral), the vehicle
will be free to roll, even if the shift lever
is in P (Park). So be sure the transfer case
is in a drive gear
–
not in N (Neutral).
(Continued)
