GMC Duramax 3.0L, Supplement Manual, Page: 16 / 71

Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
Driving and Operating 15
Observe the wait-to-start light.
See
Wait-to-Start Light 0 11 .
This light may not come on if
the engine is warm.
2. The wait-to-start light may be
illuminated, depending on
temperature conditions. There
will be a delay in engine
cranking after pressing
ENGINE START/STOP based
on temperature conditions. In
extremely cold temperatures
the delay will be longer. At the
end of the delay the engine will
begin to crank and will continue
to crank until the engine starts.
Caution
If the wait-to-start light stays on
after starting the vehicle, the
vehicle may not run properly.
Have the vehicle serviced
right away.
3. If the engine does not start
after 15 seconds of cranking,
turn the ignition off. Wait
one minute for the cranking
motor to cool, then try the
same steps again.
If you are trying to start the engine
after you have run out of fuel, follow
the steps in
Running Out of Fuel
0 30 .
When the engine is cold, let it run
for a few minutes before driving.
This lets oil pressure build up. The
engine will sound louder when it
is cold.
For turbo protection, engine power
at speeds above idle may be limited
if the engine is cold. This protection
can last up to a maximum of
40 seconds at extreme cold coolant
and ambient temperatures.
Cold Weather Starting
Use the recommended engine oil
when the outside temperature
drops below freezing. See
Engine
Oil 0 38 . When the outside
temperature drops below – 18 °C
(0 °F), use of the engine coolant
heater is recommended.
If you experience longer cranking
times, notice an unusual amount of
exhaust smoke, or are at higher
elevations (over 2 135 m or 7,000 ft),
you may use the engine heater. See
“ Engine Heater ” in the owner ’ s
manual.
See Fuel for Diesel Engines 0 25 for
information on what fuel to use in
cold weather.
If the Diesel Engine Will Not
Start
If the vehicle runs out of fuel, see
Running Out of Fuel 0 30 .
If the vehicle is not out of fuel, and
the engine will not start:
Place your foot on the brake and
press ENGINE START/STOP.
If the wait-to-start light does not go
off, wait a few seconds, then try
starting the engine again. See your
dealer as soon as possible for a
starting system check.