Stop/Start System - GMC CHEVROLET Silverado 1500 2021 Owner's Manual

Caution
Cranking the engine for long periods of
time, by returning the ignition to the
START position immediately after
cranking has ended, can overheat and
damage the cranking motor, and drain
the battery. Wait at least 15 seconds
between each try, to let the cranking
motor cool down.
2. If the engine does not start after five to
10 seconds, especially in very cold
weather (below 18 °C or 0 °F), it could
be flooded with too much gasoline. Try
pushing the accelerator pedal all the way
to the floor and holding it there while
holding the key in START or ENGINE
START/STOP for up to a maximum of
15 seconds. Wait at least 15 seconds
between each try, to allow the cranking
motor to cool down. When the engine
starts, let go of the key or button and
accelerator. If the vehicle starts briefly
but then stops again, do the same thing.
This clears the extra gasoline from the
engine. Do not race the engine
immediately after starting it. Operate
the engine and transmission gently until
the oil warms up and lubricates all
moving parts.

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.
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 Tachometer 0 110. When
the brake pedal is released or the
accelerator pedal is pressed, the engine will
restart.
Driving and Operating
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 in any gear other than
D (Drive).
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.
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