Running The Vehicle While Parked - GMC 2008 Chevrolet Tahoe Supplemental Owner's Manual

The braking system is computer controlled and uses the
information provided by the driver's input at the brake
pedal to seamlessly blend the regenerative braking with
the conventional hydraulic disc brakes to meet any
requirements for deceleration. The brake controller in
your vehicle has a high pressure accumulator to provide
the hydraulic pressure to the disc brakes in response to
the driver's input. The controller interprets the braking
request and uses regenerative braking, conventional
hydraulic braking or a combination of both as necessary.
Since the controller applies the hydraulic brakes through
its high pressure accumulator, you may occasionally hear
the motor driven pump in the controller when it runs to
recharge the system. This recharging cycle is normal.
Even though the conventional disc brakes are operated
by the controller, there is still a direct mechanical
connection with the brake pedal and the hydraulic brake
system in the unlikely event of a controller problem. See
"Warning Lights, Gages, and Indicators" and "Driver
Information Center (DIC)" in the Index of the vehicle's
owner manual. In the event of a controller problem, your
brake pedal may be harder to push and the stopping
distance may be longer.
2-10

Running the Vehicle While Parked

It is better not to park with the engine running. But if you
ever have to, here are some things to know.
CAUTION:
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Exiting your vehicle, without first shifting into
PARK (P), may cause the vehicle to move, and
you or others can be seriously injured.
Because your vehicle has the Automatic Engine
Start/Stop feature, the vehicle's engine might
seem to be shut off when you come to a
complete stop. However, once the brake pedal
is released, the vehicle can move. The vehicle's
engine can also restart at any time.
Shift to PARK (P) and turn the ignition to
LOCK/OFF, before exiting the vehicle.
Follow the proper steps to be sure your vehicle will not
move. See "Shifting Into PARK (P)" in the owner manual
for more information.
If you are pulling a trailer, see Towing a Trailer on
page 4-2 for more information.