Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
16
Driving and Operating
If the wait-to-start light comes on
and then goes off and you know the
battery is charged, but the engine
still will not start, the vehicle needs
service.
If the wait-to-start light does not
come on when the engine is cold,
the vehicle needs service.
If the battery does not have enough
charge to start the engine, see
“
Battery
”
in the owner
’
s manual.
Check that the correct engine oil
has been used and changed at
appropriate intervals. If the wrong oil
is used, the engine may be harder
to start.
Be sure to use the proper fuel for
existing weather conditions. See
If the engine starts, runs a short
time, then stops, the vehicle needs
service.
{
Warning
Do not use gasoline or starting
aids, such as ether, in the air
intake. They could damage the
engine, which may not be
covered by the vehicle warranty.
They could also cause a fire,
which could cause serious
personal injury.
Engine Idle Variations
Under certain conditions the engine
idle speed can vary or be elevated.
Change in idle speed is normal and
does not indicate a problem. Normal
conditions that can raise idle speed
are low voltage, DPF regeneration,
air conditioning compressor loads,
and engine warmup. These speeds
can range from approximately 600
to 1000 rpm.
Engine Heater
{
Warning
Do not plug in the engine block
heater while the vehicle is parked
in a garage or under a carport.
Property damage or personal
injury may result. Always park the
vehicle in a clear open area away
from buildings or structures.
If equipped, the engine heater can
provide easier starting in cold
weather conditions at or below
−
18 °C (0 °F).
For engine heater operation, see
“
Engine Heater
”
in the owner
’
s
manual.