GMC Duramax Diesel 2015 Owner's Manual page 29

9-2 Driving and Operating
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 on
page 5-10. This light may not
come on if the engine is warm.
2. If the wait-to-start light is
illuminated, wait until this light
goes off to. 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 on
page 9-33.
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.
Cold Weather Starting (Diesel
Engine)
Use the recommended engine oil
when the outside temperature drops
below freezing. See Engine Oil on
page 10-6. 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 on
page 9-9.
See Fuel for Diesel Engines on
page 9-21 for information on what
fuel to use in cold weather.
If the Diesel Engine Will Not
Start
If you have run out of fuel, see
Running Out of Fuel on page 9-33.