Black plate (2,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - crc - 6/5/14
1-2
In Brief
Heater Performance Mode
When cold weather conditions are
detected, the transmission raises
part throttle upshift points after the
1 (First) to 2 (Second) upshift to
increase engine speed. This feature
shortens engine and cab warm up
times.
When the transmission is in this
mode, upshifts may be delayed.
This is normal and does not indicate
an operational problem.
Four-Wheel Drive
When operating in 4
↓
(Four-Wheel-Drive Low), there is a
very deep gear reduction. The
resulting shifts will feel exaggerated.
Performance and
Maintenance
Engine Oil Life System
The engine oil life system calculates
engine oil life based on vehicle use
and displays the CHANGE ENGINE
OIL SOON message when it is time
to change the engine oil and filter.
The oil life system should be reset
to 100% only following an oil
change. See
“
Engine Oil Life
System
”
in the owner manual.
Diesel Particulate Filter
The Duramax engine is equipped
with a Diesel Particulate Filter (DPF)
that, by design, will filter or trap
particulates. The DPF is located
under the vehicle in the exhaust
system.
Depending on a number of factors
monitored by the engine computer,
the DPF will need to be cleaned of
accumulated solids. When a
cleaning is needed, the engine
computer will initiate a cleaning
action by warming the exhaust gas
temperature. This feature has been
designed to operate automatically,
with limited operator involvement or
awareness.
Cleaning the DPF (Exhaust
Filter)
While the DPF cleaning is
automatically controlled by the
engine computer, the vehicle will
need to operate continuously until
the CLEANING EXHAUST FILTER
KEEP DRIVING UNTIL MESSAGE
IS CLEARED message is no longer
displayed. Cleaning occurs most
effectively above 48 km/h (30 mph).
If the vehicle is returned to idle
during the cleaning process, the
driver may notice a slightly different
sound or a slightly elevated engine
idle speed. This is normal. No action
is required on the part of the driver
during a regular DPF cleaning. See
Diesel Particulate Filter on
page 9-11
.
