GMC HUMMER EV 2023 Owner's Manual page 349

348 Vehicle Care
Caution
The vehicle may be equipped with an
electric parking brake and/or an
electronic shifter. In the event of a loss of
12-volt battery power, the electric parking
brake cannot be released, and the vehicle
cannot be shifted to N (Neutral). Tire
skates or dollies must be used under the
non-rolling tires to prevent damage while
loading/unloading the vehicle. Dragging
the vehicle will cause damage not
covered by the vehicle warranty.
Contact a professional towing service if the
disabled vehicle must be transported. GM
requires a flatbed tow truck or a trailer to
transport a disabled vehicle. Use ramps to
help reduce approach angles, if necessary.
Your vehicle was neither designed nor
intended to be towed with any of its wheels
on the ground. However, if the vehicle must
be towed with its wheels on the ground to
reach a safe location for loading on a
flatbed tow truck or trailer, see the
limitations below:
Your vehicle is pulled facing forward.
Your vehicle is successfully shifted to
N (Neutral).
The maximum speed of your vehicle is
20 km/h (12.4 MPH).
The maximum distance towed is 60 km
(37.3 mi).
Preparing the Vehicle:
Before the vehicle is loaded or secured on
the flat bed, with the vehicle ON, doors
closed, and hood closed, use the ride height
buttons to open the ride height menu. See
Air Suspension 0 201.
Select Entry/Exit Height to lower the vehicle.
Once the vehicle is lowered to Entry/Exit
Height, enable "Service Mode" in the
infotainment screen under
Settings>Vehicle>Suspension to hold the
suspension in the lowered position. If 12V
power is not available, perform a jump start
to temporarily provide power to put the
vehicle into these modes. See Jump Starting
- North America 0 344.
If the vehicle speed exceeds 32 km/h
(20 mph) after these steps, Service mode will
automatically exit and the procedure will
need to be repeated.
The vehicle must be in N (Neutral) and the
electric parking brake must be released
when loading the vehicle onto a flatbed tow
truck.
If the vehicle is equipped with car wash
mode and has 12-volt battery power, refer
to Car Wash Mode under Electric Drive
Unit 0 184 to place the vehicle in
N (Neutral).
If the 12-volt battery is dead and/or the
vehicle will not start, the vehicle will not
move. Try to jump start the vehicle. Refer
to Jump Starting - North America 0 344
and if the jump start is successful, retry
the Car Wash Mode procedure. If the
hood will not open, refer to Hood 0 292
for manual hood release location.
In the event the charging cord will not
release, see Emergency Manual Charge
Cord Release under Plug-In Charging
0 253.