Locking Front Axle - GMC Hummer EV 2024 Owner's Manual

GMC Hummer EV Owner Manual (GMNA-Localizing-MidEast-16639039) -
2024 - CRC - 3/20/23
206 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.
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

If equipped, 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
0 200. If it was not already locked, the rear
axle will lock first followed by the
front axle.