Adding Diesel Exhaust Fluid
The DEF gauge (located on the instrument cluster) will
display the level of DEF remaining in the tank. Refer to
“Instrument Cluster” and “Instrument Cluster Descrip-
tions” in “Getting To Know Your Instrument Panel” for
further information.
NOTE:
•
Driving conditions (altitude, vehicle speed, load,
etc.) will affect the amount of DEF that is used in
your vehicle.
•
Another factor is that outside temperature can
affect DEF consumption. In cold conditions, 12°F
(-11°C) and below, the DEF gauge needle can stay
on a fixed position and may not move for extended
periods of time. This is a normal function of the
system.
•
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 Specifica-
tions” for the correct fluid type.
1. Remove cap from DEF tank (located on driver’s side
of the vehicle or in fuel door).
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 conditions, 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 inaccurate level
readings.
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, how-
ever, if the tank is overfilled and freezes, the sys-
tem could be damaged.
•
When DEF is spilled, clean the area immediately
with water and use an absorbent material to soak
up the spills on the ground.
•
Do not attempt to start your engine if DEF is acci-
dentally 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.
•
Never add anything other than DEF to the tank –
especially any form of hydrocarbon such as diesel
fuel, fuel system additives, gasoline, or any other
petroleum-based product. Even a very small
amount of these, less than 100 parts per million or
less than 1 oz. per 78 Gallons (295 Liters) will con-
taminate the entire DEF system and will require
replacement. If owners use a container, funnel or
nozzle when refilling the tank, it should either be
new or one that has only been used for adding
DEF. Mopar® provides an attachable nozzle with
its DEF for this purpose.
Fill Locations
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
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STARTING AND OPERATING
