Lockout Protection; Safety Locks - GMC Sierra 2500 HD 2023 Owner's Manual

If a vehicle door is unlocked, and then
opened and closed, the doors will lock either
when your foot is removed from the brake
or the vehicle speed becomes faster than
13 km/h (8 mph).
To unlock the doors:
Press on the power door lock switch.
Shift the transmission into P (Park).
Automatic door locking cannot be disabled.
Automatic door unlocking can be
programmed. To view available settings
from the infotainment screen, touch Settings
> Vehicle > Power Door Locks.

Lockout Protection

If equipped, the ignition is on or in
accessory mode and the power door lock
switch is pressed with the driver door open,
all the doors will lock and only the driver
door will unlock.
If the vehicle is off and locking is requested
while a door is open, when all doors are
closed the vehicle will check to the Keyless
Access function (if equipped). If an RKE
transmitter is detected and the number of
RKE transmitters inside has not reduced, the
driver door will unlock and the horn will
chirp three times.
Lockout Protection can be manually
overridden with the driver door open by
pressing and holding on the power door
lock switch.
Open Door Anti-Lockout
If equipped, the Open Door Anti-Lockout is
turned on and the vehicle is off, the driver
door is open, and locking is requested, all
the doors will lock and the driver door will
unlock. The Open Door Anti-Lockout feature
can be turned on or off. To view available
settings from the infotainment screen, touch
Settings > Vehicle > Power Door Locks.

Safety Locks

The rear door safety locks prevent
passengers from opening the rear doors
from inside the vehicle.
Keys, Doors, and Windows
The safety lock is on the inside edge of the
rear doors. To use the safety lock:
1. Move the lever down to the lock
position.
2. Close the door.
3. Do the same for the other rear door.
To open a rear door when the safety lock
is on:
1. Unlock the door by activating the inside
handle, by pressing the power door
unlock switch, or by using the Remote
Keyless Entry (RKE) transmitter.
2. Open the door from the outside.
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