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304 STARTING AND OPERATING
(Continued)
There is an electric heater inside the DEF tank
that automatically works when necessary. And if
the DEF supply does freeze, the truck will
operate normally until it thaws.
DEF FILL PROCEDURE
NOTE:
Refer to “Fluids And Lubricants” in “Technical
Specifications” for the correct fluid type.
1. Remove cap from DEF tank (located on
driver’s side of the vehicle or in fuel door).
Fill Locations
2. Insert DEF fill adapter/nozzle into DEF tank
filler neck.
NOTE:
The DEF gauge may take up to five seconds
to update after adding a gallon or more of
Diesel Exhaust Fluid (DEF) to the DEF tank.
If you have a fault related to the DEF
system, the gauge may not update to the
new level. See an authorized dealer for
service.
The DEF gauge may also not immediately
update after a refill if the temperature of the
DEF fluid is below 12°F (-11°C). The DEF
line heater will possibly warm up the DEF
fluid and allow the gauge to update after a
period of run time. Under very cold condi-
tions, it is possible that the gauge may not
reflect the new fill level for several drives.
Excessive overfilling of the DEF tank can
result in a MIL lamp/fault code and inaccu-
rate level readings.
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
CAUTION!
To avoid DEF spillage, and possible damage to
the DEF tank from overfilling, do not “top off”
the DEF tank after filling.
DO NOT OVERFILL. DEF will freeze below
12ºF (-11ºC). The DEF system is designed to
work in temperatures below the DEF freezing
point, however, if the tank is overfilled and
freezes, the system could be damaged.
When DEF is spilled, clean the area immedi-
ately with water and use an absorbent mate-
rial to soak up the spills on the ground.
Do not attempt to start your engine if DEF is
accidentally added to the diesel fuel tank as it
can result in severe damage to your engine,
including but not limited to failure of the fuel
pump and injectors.
20_DJD2_OM_EN_USC_t.book Page 304
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