2011 CHEVROLET TAHOE key battery

Black plate (4,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
1-4 In Brief
A chime will sound if the driver door
is opened while in Auto Stop as a
reminder that the ignition switch is
not in the LOCK/OFF position.
Always turn the ignition switch to
LOCK/OFF and remove the key
from the ignition switch when exiting
the vehicle.
Auto Start
The vehicle also has an Auto Start
feature. The engine will remain off
while in Auto Stop mode until
vehicle conditions require the
engine to run. The near-instant
starting of the engine from Auto
Stop mode is called Auto Start.
EV Mode
The vehicle also has an EV mode
which uses only the electric motor to
move the vehicle. With light
acceleration, the vehicle will drive in
EV mode. EV mode is unavailable
when the vehicle is out of fuel.
For more information on Auto Stop,
Auto Start, and EV Mode, see
Starting the Vehicle on page 9‑2.
Regenerative Braking
Regenerative braking enables the
electric drive motor to operate as a
generator when coasting or braking.
Energy from the moving vehicle
recharges the hybrid battery.
The hydraulic disc brakes work with
the regenerative braking to insure
effective braking.
The braking system is computer
controlled and blends the
regenerative braking with the
conventional hydraulic disc brakes
to meet any requirements for
deceleration. Because the controller
applies the hydraulic brakes through
its high pressure accumulator, you
may occasionally hear the motor
driven pump when it recharges the
system. This is normal. In the event
of a controller problem, the brake
pedal may be harder to push and
the stopping distance may be
longer.
SeeRegenerative Braking on
page 9‑15.
Battery
This vehicle has a standard 12-volt
battery and a high voltage hybrid
battery. When a new standard
12-volt battery is needed, see your
dealer for one that has the
replacement number shown on the
original battery's label. Only a
trained service technician with the
proper knowledge and tools should
inspect, test, or replace the hybrid
battery. See your dealer if the hybrid
battery needs service. See Battery
on page 10‑12.
Service
Never try to do your own service on
hybrid components. You can be
injured and the vehicle can be
damaged if you try to do your own
service work. Service and repair of
these hybrid components should
only be performed by a trained
service technician with the proper
knowledge and tools. See Doing
Your Own Service Work on
page 10‑2.

Black plate (2,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
9-2 Driving and Operating
Starting and
Operating
Starting the Vehicle
{WARNING
Exiting the vehicle, without first
shifting into P (Park), may cause
the vehicle to move, and you or
others can be seriously injured.
Because the 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 P (Park) and turn the
ignition to LOCK/OFF, before
exiting the vehicle.Start the engine as you would any
other engine. See
“Starting the
Engine” in the owner manual for
more information on starting.
If pulling a trailer with trailer brakes,
see Towing Equipment on
page 9‑17 for more information.Auto Stop
The vehicle has an Auto Stop
feature. After a successful engine
start, the engine may turn off and
operate in the Auto Stop mode.
Some of the vehicle conditions that
allow the engine to stop running and
enter the Auto Stop mode are:
.Ignition switch is in the ON/RUN
position.
.The hood is closed.
.The gear selector is in P (Park),
R (Reverse), N (Neutral) or
D (Drive).
.The hybrid battery is at an
acceptable state of charge.
.The hybrid battery voltage,
temperature or power limits are
not exceeded. In very hot
conditions, Auto Stop may be
unavailable until the hybrid
battery has cooled.
.The engine is at operating
temperature.
.The vehicle may enter Auto Stop
after a remote vehicle start.
With your foot off the brake and the
vehicle on level ground, the hybrid
drive motor may cause the vehicle
to roll slowly forward, even when the
engine is in Auto Stop.
Keep your foot firmly on the brake
pedal until you are ready for the
vehicle to move.
Engine OFF and AUTO STOP
modes are indicated on the
tachometer display. When the
tachometer needle indicates OFF,
the engine is not running and will
remain off until the ignition key is
placed in the START position or a
remote vehicle start is performed.

Black plate (3,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Driving and Operating 9-3
When the tachometer needle
indicates AUTO STOP, the hybrid
system is on, the engine is not
running, but may Auto Start at any
time without notice. SeeTachometer
on page 5‑4 for more information.
A chime will sound if the driver door
is opened while in Auto Stop as a
reminder that the ignition switch is
not in the LOCK/OFF position.
Always turn the ignition switch to
LOCK/OFF and remove the key
from the ignition switch when exiting
the vehicle.
Auto Start
The vehicle also has an Auto Start
feature. The engine will remain off
while in Auto Stop mode until
vehicle conditions require the
engine to run. The near-instant
starting of the engine from Auto
Stop mode is called Auto Start. Some of the vehicle conditions that
may cause the engine to Auto
Start are:
.The hood is opened.
.The gear selector is in
M (Manual Mode).
.The hybrid battery state of
charge is too low.
.The hybrid battery voltage,
temperature or power limits are
exceeded.
.A remote vehicle start has been
requested.
.The engine is not at operating
temperature.
.Acceleration demands require
the use of the engine.
EV Mode
The vehicle also has an Electric
Vehicle (EV) mode which uses only
the electric motor to move the
vehicle. With light acceleration, the
vehicle will drive in EV mode. EV
mode is unavailable when the
vehicle is out of fuel.
If increased acceleration is
required, or the vehicle reaches
approximately 40 km/h (30 mph), the
engine will start automatically. The
engine shuts off at speeds below
40 km/h (25 mph) unless the
transmission is in M (Manual Mode)
or Auto Stop is disabled.
During heavy acceleration, both the
engine and hybrid electric motors
supply power. A sensation similar to
a transmission gear change can be
felt as the transmission changes
modes. Engine RPM may remain
above 4,000 RPM for a longer
period during hard acceleration.