Battery - North America - GMC HUMMER EV 2022 Owner's Manual

302 Vehicle Care
What to Add
Use only GM approved DOT 4 brake fluid
from a clean, sealed container. See
Recommended Fluids and Lubricants 0 366.
Warning
The wrong or contaminated brake fluid
could result in damage to the brake
system. This could result in the loss of
braking leading to a possible injury.
Always use the proper GM approved
brake fluid.
Caution
If brake fluid is spilled on the vehicle's
painted surfaces, the paint finish can be
damaged. Immediately wash off any
painted surface.

Battery - North America

The original equipment battery is
maintenance free. Do not remove the cap
and do not add fluid.
This vehicle has a high voltage battery and
a standard 12-volt battery.
Warning
Damage to the high voltage battery or
high voltage system can create a risk of
electric shock, overheating, or fire.
If the vehicle is damaged from a
moderate to severe crash, flood, fire,
or other event, the vehicle should be
inspected as soon as possible. Until the
vehicle has been inspected, store it
outside at least 15 m (50 ft) from any
structure or anything that can burn.
Ventilate the vehicle by opening a
window or a door.
Contact Customer Assistance as soon as
possible to determine whether an
inspection is needed. See Customer
Assistance Offices 0 372.
If the vehicle is in a crash, the sensing
system may shut down the high voltage
system. When this occurs, the high voltage
battery is disconnected and the vehicle will
not start. The SERVICE VEHICLE SOON
message in the Driver Information Center
(DIC) will display. Before the vehicle can
operate again, it must be serviced at your
dealer.
See If a Crash Occurs under Collision
Damage Repair 0 376 for additional
information. If an airbag inflates, see What
Will You See after an Airbag Inflates? 0 56.
Only a trained service technician with the
proper knowledge and tools should inspect,
test, or replace the high voltage battery.
See your dealer if either the 12-volt or high
voltage battery needs service. The dealer
has information on how to recycle the
high voltage battery. There is also
information available at
https://www.recyclemybattery.com.
Keep the vehicle plugged in, even when fully
charged, to keep the high voltage battery
temperature ready for the next drive. This is
important when outside temperatures are
extremely hot or cold.
Propulsion power may be reduced in
extremely cold temperatures, or if the high
voltage battery is too cold. The message
BATTERY TOO COLD, PLUG IN TO WARM will
display. If the message displays, a level 2
charger is required to heat the battery to a
minimum temperature to enable propulsion
or charging.