Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
76 Vehicle Care
If the system determines that the
vehicle was not allowed to restart,
or if a condition such as an open
hood has been detected, then DIC
messages display and a chime will
sound. To help with system
performance, either restart the
engine, or if the engine is not
running and the hood can be safely
opened after one minute, open the
hood to allow cooling.
If the system has automatically
restarted the engine, the vehicle
cannot move until cooling has
completed and the engine
automatically turns off. Overriding
this feature will allow normal vehicle
operation. To override, start the
vehicle as you would normally. Then
either drive the vehicle as normal or
turn off the ignition if you must exit
the vehicle. Opening the hood will
prevent the restart or will turn the
engine off when this feature is
active.
Interactions with Manual
Regen
If the system has determined that
the engine should be restarted, then
the manual regen feature will not be
allowed.
If manual regen has been enabled,
and the system has determined that
the engine should be restarted,
there will be no chime or DIC
messages related to the Diesel
Engine After Run Feature until the
manual regen completes. If the
engine is turned off during the
manual regen, a restart may occur
without any alerts.
Engine Fan
The vehicle has a clutched engine
cooling fan. When the clutch is
engaged, the fan spins faster to
provide more air to cool the engine.
In most everyday driving conditions,
the fan is spinning slower and the
clutch is not fully engaged. This
improves fuel economy and reduces
fan noise. Under heavy vehicle
loading, trailer towing, and/or high
outside temperatures, the fan speed
increases as the clutch more fully
engages, so an increase in fan
noise may be heard. This is normal
and should not be mistaken as the
transmission slipping or making
extra shifts. It is merely the cooling
system functioning properly. The fan
will slow down when additional
cooling is not required and the
clutch partially disengages.
This fan noise may be heard when
starting the engine. It will go away
as the fan clutch partially
disengages.
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