Locking Front Axle - GMC HUMMER EV 2022 Owner's Manual

After pressing the switch to unlock the axle,
it may remain locked due to torque in the
driveline. To quickly unlock the axle, turn
the steering wheel to the right and to the
left while traveling at a low speed.

Locking Front Axle

The locking front axle can give the vehicle
additional traction when traveling in off-road
situations such as mud, snow, steep hills,
and uneven terrain. The locking front axle
must not be used on high traction surfaces
such as pavement.
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, suspension,
and steering systems could be damaged.
Repairs would not be covered by the
vehicle warranty. Do not use the locking
axle on pavement.
Warning
Driving on pavement with a locked front
axle may cause reduction to or complete
loss of steering assist, which could result
in serious injury, death, or property
damage. Do not use the locking front
axle on pavement.
Before the front axle can be locked, the
vehicle must be in Terrain Mode. See
Terrain Mode under Driver Mode Control
0 197. To lock the front axle, press the
front/rear axle locking switch. If it was not
already locked, the rear axle will lock first
followed by the front axle.
Driving and Operating
To lock the front axle:
1. Press the front/rear axle locking switch
and hold for five seconds. The vehicle
must be stopped or moving less than
24 km/h (15 mph).
2. Wait for the light in the switch to stop
flashing. A solid light indicates the front
axle is locked. The front axle lock will
disable the Antilock Brake System (ABS)
and illuminate the ABS warning light.
To unlock the front axle:
1. Press the rear axle locking switch. The
front axle will unlock and the rear axle
will remain locked. See Locking Rear Axle
0 202.
203