Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada-
11354421) - 2018 - CRC - 5/9/17
34 Driving and Operating
The FOH will turn on if all of the
following conditions exist:
.
Outside air temperature is below
or equal to 4 °C (39 °F).
.
Fuel level is greater or equal to
12.5% of the total fuel tank
volume.
.
The engine is running.
.
Coolant temperature is less than
70 °C (158 °F).
Parking over Things
That Burn
{
Warning
Things that can burn could touch
hot exhaust parts under the
vehicle and ignite. Do not park
over papers, leaves, dry grass,
or other things that can burn.
Diesel Particulate
Filter
The vehicle has a Diesel Particulate
Filter (DPF) as part of the exhaust
system to reduce vehicle emissions.
The DPF requires a unique exhaust
tailpipe with an exhaust cooler. The
exhaust cooler mixes air with the
exhaust to lower the temperature
before it leaves the tailpipe.
The DPF, the tailpipe, or other
exhaust system components must
not be altered. Inspect regularly and
clean any mud or dirt from the
exhaust cooler, especially where the
exhaust cooler connects to the
tailpipe and the openings where
fresh air enters the cooler.
The DPF will clean itself as part of
normal operation. Several factors
including fuel consumed, hours of
engine operation, and miles driven
are monitored by the Engine Control
Module (ECM). The self-cleaning
occurs approximately once per tank
of fuel.
Caution
Permanent damage can occur to
the DPF or related components if
the required Ultra Low Sulfur
Diesel (15 ppm sulfur maximum)
or low ash CJ-4 engine oil is not
used. This damage would not be
covered by the vehicle warranty.
Under certain driving conditions,
such as stop-and-go traffic, the filter
cannot clean itself. A message
comes on when the DPF is dirty and
needs to perform a self cleaning.
For the filter to clean itself, the
vehicle must be driven above
50 km/h (30 mph) until the message
goes off. This will take about
30 minutes.
{
Warning
During DPF self cleaning or
during extended idling in P (Park),
the exhaust system and exhaust
gases are very hot. Things that
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