Engine Heater - GMC Sierra Denali 1500 2023 Owner's Manual

Warning (Continued)
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 Tachometer 0 114. 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 needs to charge.
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).
Certain driver modes have been selected.
See Driver Mode Control 0 242 and
Four-Wheel Drive 0 233.
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.
Driving and Operating
Auto Stop Disable Switch
The automatic engine Stop/Start feature can
be disabled and enabled by pressing
Auto Stop/Start is enabled each time you
start the vehicle.
h
When the indicator is illuminated, the
system is enabled.

Engine Heater

If equipped, the engine heater can provide
easier starting and better fuel economy
during engine warm-up in cold weather
conditions at or below 18 °C (0 °F). Vehicles
with an engine heater should be plugged in
at least four hours before starting. An
internal thermostat in the plug-end of the
217
h
.