GMC HUMMER EV 2022 Manual page 127

126 Vehicle Care
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
the owner's manual.
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 0 122.
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 73 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 0 122
and if the jump start is successful, retry
the "Car Wash Mode" procedure. If the
hood will not open, refer to the owner's
manual 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 82.
If jump starting is unsuccessful, the
.
vehicle will not move. Tire skates or
dollies must be used under the non-rolling
tires to prevent vehicle damage.
Front Tow Hooks
The vehicle is equipped with two front tow
hooks used to pull the vehicle onto a flatbed
car carrier from a flat road surface. Always
pull straight, do not pull sideways on the
tow hooks.