GMC Sierra 2500 HD 2024 Owner's Manual page 30

28 Keys, Doors, and Windows
Switches in the inner tailgate prevent the
primary tailgate from being opened when
the inner tailgate is not fully closed.
To open the primary tailgate:
Press twice quickly on the remote
key until the tailgate moves. See Remote
Key Operation 0 15. If equipped with
Keyless Access, the tailgate can be
opened if the remote key is within
1 m (3 ft).
Press on the center stack.
Press the lower touch pad on the tailgate
handle after unlocking all doors. Use the
top of the tailgate to pull against if
assistance is required.
To close the primary tailgate, firmly push it
upward until it latches. Pull it back to be
sure it is latched securely.
To open the inner tailgate, press the upper
touch pad on the tailgate handle after
unlocking all doors. Pull the top of the
tailgate to open.