Malfunction Indicator Lamp (Check Engine Light) - GMC duramax diesel 2016 Supplement Manual

18 Instruments and Controls
Metric Van Models
English Van Models
Caution
Lack of proper engine oil
maintenance can damage the
engine. Driving with the engine oil
low can also damage the engine.
The repairs would not be covered
by the vehicle warranty. Check
the oil level as soon as possible.
Add oil if required, but if the oil
level is within the operating range
and the oil pressure is still low,
have the vehicle serviced. Always
follow the maintenance schedule
for changing engine oil.
The engine oil pressure gauge
reads in kPa (kilopascals) or psi
(pounds per square inch) when the
engine is running. Oil pressure may
vary with engine speed, outside
temperature, and oil viscosity.
If readings are outside the normal
operating range, the low oil
pressure message may display on
the Driver Information Center (DIC),
or for vehicles without DIC the oil
pressure light will come on. If the oil
pressure message or light comes
on, check the oil level immediately.
Do not operate the engine with the
oil pressure warning light on or an
ENGINE OIL LOW ADD OIL
message displayed.
Malfunction Indicator
Lamp (Check Engine
Light)
This light is part of the vehicle s
emission control on-board
diagnostic system. If this light is on
while the engine is running, a
malfunction has been detected and
the vehicle may require service. The
light should come on to show that it
is working when the ignition is in
ON/RUN with the engine not
running. See Ignition Positions in
the owner manual.
This light may also come on when
the system has detected a problem
with the Diesel Exhaust Fluid (DEF)
management system. See Diesel
Exhaust Fluid 0 39.