Diesel Exhaust Fluid (Def) Warning; Light; Power Take-Off Light; Information Displays - Chevrolet GMC Duramax 2023 Manual

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8
Instruments and Controls
Diesel Exhaust Fluid (DEF)
Warning Light
This light, a Driver Information Center (DIC)
message, and a chime come on when there
is an issue with the Diesel Exhaust Fluid
system.
If the DEF issue has not been corrected, the
light will continue to flash when the vehicle
is started. The vehicle's speed may also be
limited.
See Diesel Exhaust Fluid 0 19.

Power Take-Off Light

Chassis Cab
The vehicle may have a Power Take-Off
(PTO) light. Under normal operating
conditions, the PTO light will remain on
throughout the PTO operating cycle. If all
conditions required to engage PTO have not
been met when enabling PTO, the PTO light
will turn on, then turn off after one second.
See Power Take-Off (PTO) 0 30.

Information Displays

Driver Information Center (DIC)

The DIC is in the instrument cluster. The DIC
comes on when the ignition is on.
A Duramax diesel vehicle may have the
following additional DIC menu items:
DEF : Displays the Diesel Exhaust Fluid (DEF)
level as a bar graph with individual
segments that illuminate from Empty (E) to
Full (F). When LOW appears on the display
and the segments turn red, add DEF as soon
as possible. For a guide on how much DEF
to add, see Diesel Exhaust Fluid 0 19.
Fuel Filter Life Remaining : This display
shows an estimate of the fuel filter's
remaining useful life. If 90% Fuel Filter Life
Remaining is displayed, it means 90% of the
current fuel filter life remains. The fuel filter
life system will alert when to change the
fuel filter on a schedule consistent with your
driving conditions.
When the remaining fuel filter life is low,
the CHANGE FUEL FILTER message will
appear on the display. Change the fuel filter
as soon as possible.
Fuel Filter Life Reset : Reset the Fuel Filter
Life Remaining display after each fuel filter
change. It will not reset itself. Also, be
careful not to reset the display at any time
other than when the fuel filter has just been
changed because it cannot be reset
accurately until the next fuel filter change.
The fuel filter life will change to 100% when
the system has been reset. To reset the
system, press and hold the thumbwheel for
two seconds while Fuel Filter Life Remaining
is displayed on the DIC.

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