GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
Driving and Operating
229
Stop/Start System
This vehicle has a Stop/Start system to shut
off the engine to help conserve fuel. It has
components designed for the increased
number of starts.
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Warning
The automatic engine Stop/Start feature
causes the engine to shut off while the
vehicle is still on. Do not exit the vehicle
before shifting to P (Park). The vehicle
may restart and move unexpectedly.
Always shift to P (Park), and then turn
the ignition off before exiting the vehicle.
Auto Engine Stop/Start
When the brakes are applied and the vehicle
is at a complete stop, the engine may turn
off. When stopped, the tachometer displays
AUTO STOP. See
. When
the brake pedal is released or the
accelerator pedal is pressed, the engine will
restart.
To maintain vehicle performance, other
conditions may cause the engine to
automatically restart before the brake pedal
is released.
Auto Stops may not occur and/or Auto
Starts may occur because:
.
The climate control settings require the
engine to be running to cool or heat the
vehicle interior.
.
The vehicle battery charge is low.
.
The vehicle battery has recently been
disconnected.
.
Minimum vehicle speed has not been
reached since the last Auto Stop.
.
The accelerator pedal is pressed.
.
The engine or transmission is not at the
required operating temperature.
.
The outside temperature is not in the
required operating range.
.
The vehicle is shifted out of D (Drive) to
any gear other than P (Park).
.
Tow/Haul Mode or other driver modes
have been selected.
.
The vehicle is on a steep hill or grade.
.
The driver door has been opened or the
driver seat belt has been unbuckled.
.
The hood has been opened.
.
The Auto Stop has reached the maximum
allowed time.
Auto Stop Disable Switch
Uplevel Shown, Others Similar
The automatic engine Stop/Start feature can
be disabled and enabled by pressing
h
.
Auto Stop is enabled each time you start
the vehicle.
When
h
is illuminated, the system is
enabled.
Retained Accessory Power (RAP)
When the ignition is turned from on to off,
the following features (if equipped) will
continue to function for up to 10 minutes,
or until the driver door is opened. These
features will also work when the ignition is
in RUN or ACC/ACCESSORY:
