Economy Gauge; Automatic Engine Stop/Start; Operation; The Engine Will Remain Running When - GMC tahoe 2009 Getting To Know Manual

Economy Gauge

The economy gauge shows when
vehicle fuel economy is being
maximized. Driving with the needle in
the solid green area indicates driving
behavior that maximizes fuel economy.
Accelerating too aggressively will move
the needle to the right, while braking
too aggressively will move the needle to
the left. Either of these behaviors will
move the needle outside the green area,
indicating less fuel efficient driving.
See your Hybrid Owner Manual.

Automatic Engine Stop/Start

Operation

The automatic engine stop/start feature,
known as Auto Stop, turns off the engine
at lower speeds until the Hybrid Energy
Storage System needs charging or the
driver requests increased power.
While the vehicle is in Auto Stop mode,
the needle on the tachometer moves to
the AUTO STOP position. The oil pres-
sure gauge also will drop to zero. While
lightly accelerating, the vehicle will be
propelled only by the electric motors.
During heavy acceleration, both the
engine and electric motors supply
power. A sensation similar to a transmis-
sion gear change may be felt as the
vehicle changes between engine power
and electric power.
While in Auto Stop, all of the regular
vehicle features are available, such as
power steering and brakes, the audio
system and power accessories.
After parking the vehicle and turning off
the engine by rotating the key to the Off
position, the tachometer needle will
move to the Off position.
See your Hybrid Owner Manual.
The Engine Will Remain
Running When:
The engine may remain running under
certain conditions. Some conditions
that would lead to an engine Auto Stop
override include:
• Driving in Reverse.
• The engine or transmission is not yet
warmed up.
• The transmission temperature or
Energy Storage System (ESS)
temperature is high.
• The engine is required to run to help
achieve the selected climate control
heating and/or cooling setting.
• The Hybrid ESS charge is low.
• The hood is not fully closed.
• The Check Engine light is illuminated.
• When playing the radio or using
electrical accessories with the vehicle
off, do not leave the key in the ACC
position for more than 30 minutes.
Instead, leave the vehicle running
and rely on the Auto Stop feature to
supply power.
See your Hybrid Owner Manual.
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