Locking Rear Axle - GMC HUMMER EV 2023 Owner's Manual

Tap the four-wheel steering button while
in Automatic Mode or CrabWalk Mode to
enter.
How to Exit Off Mode
1. The steering wheel cannot be in motion
when exiting Off Mode.
2. Tap the four-wheel steering button to
exit back to the Automatic Mode.
Steering Behavior in Off Mode
Four-wheel steering is disengaged with rear
wheels set to forward position.
Four-Wheel Steering Behavior at 0 MPH
The rear wheels may not steer to full travel
when the vehicle is stationary. Additional
travel may be achieved once the vehicle
begins to move.
Care should be taken to ensure the vehicle
path is clear of obstacles if the rear tires
steer once the vehicle is moving.

Locking Rear Axle

If equipped, the locking rear axle can give
the vehicle additional traction from the rear
wheels when traveling in off-road situations
such as mud, snow, steep hills, and uneven
terrain.
Caution
If you try to lock the axle while the
vehicle is stuck and the tires are spinning,
the vehicle s drivetrain could be damaged.
The repairs would not be covered by the
vehicle warranty. Always lock the axle
before attempting situations and/or
navigating terrain that could cause the
vehicle to become stuck.
Caution
If the vehicle s axle is locked while driving
on pavement, the drivetrain could be
damaged. Repairs would not be covered
by the vehicle warranty. Do not use the
locking axle on pavement.
Driving and Operating
To lock the rear axle:
1. Press the rear axle locking switch. The
vehicle must be moving 40 km/h
(25 mph) or less.
2. Wait for the light on the switch to stop
flashing. A solid light indicates the rear
axle is locked.
When the vehicle speed exceeds 40 km/h
(25 mph) the locking rear axle disengages.
The Off-Road Mode and Terrain Mode allow
the axle lock to remain engaged at higher
vehicle speeds.
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