GMC duramax diesel 2016 Supplement Manual page 30

Caution
Do not try to shift to P (Park) if the
vehicle is moving. If you do, you
could damage the transmission.
Shift to P (Park) only when the
vehicle is stopped.
Starting the Engine
1. Turn the ignition key to
ON/RUN.
Observe the wait-to-start light.
See Wait-to-Start Light 0 20.
This light may not come on if
the engine is warm.
2. If the wait-to-start light is on,
wait until this light goes off.
Then turn the ignition key to
START. When the engine
starts, let go of the key.
The engine has a fast warm-up
glow plug system. The
wait-to-start light will illuminate
for a much shorter time than
most diesel engines, due to the
rapid heating of the glow plug
system.
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 switch to
LOCK/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 57.
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.
Driving and Operating
Cold Weather Starting (Diesel
Engine)
Use the recommended engine oil
when the outside temperature drops
below freezing. See Engine Oil
0 92. 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 coolant
heater. See Engine Heater 0 35.
See Fuel for Diesel Engines 0 47 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 57.
If the vehicle is not out of fuel, and
the engine will not start:
Turn the ignition key to ON/RUN.
After the wait-to-start light goes off,
turn the ignition key to START.
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