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214 STARTING AND OPERATING
DEF is subject to freezing at the lowest temperatures.
For example, DEF may freeze at temperatures at or
below 12°F (-11°C). The system has been designed to
operate in this environment.
NOTE:
When working with DEF, it is important to know that:
Any containers or parts that come into contact
with DEF must be DEF compatible (plastic or
stainless steel). Copper, brass, aluminum, iron
or non-stainless steel should be avoided as they
are subject to corrosion by DEF.
If DEF is spilled, it should be wiped up completely.
Adding Diesel Exhaust Fluid
The DEF gauge (located on the instrument cluster)
will display the level of DEF remaining in the tank
Ú page 104.
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. If the
DEF supply does freeze, the truck will operate
normally until it thaws.
DEF FILL PROCEDURE
NOTE:
For the correct fluid type Ú page 447.
Remove cap from DEF tank (located on drivers side
of the vehicle or in fuel door).
Fill Locations
NOTE:
The DEF gauge may take up to five seconds to
update after adding a gallon or more of 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 tank
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.
At 40°F (4°C) you could see some increase in
the DEF gauge due to the tank thawing. The
gauge and level sensor are working properly and
are just updating with proper thawed DEF.
Excessive overfilling of the DEF tank can result
in a MIL lamp/fault code and inaccurate level
readings.
Refilling With Nozzles
You can fill up at any DEF distributor.
Proceed as follows:
Insert the DEF nozzle in the filler tube, start
refilling and stop refilling at the first shut-off
(the shut-off indicates that the DEF tank is full).
DO NOT proceed with the refilling, to prevent
spillage of DEF.
Extract the nozzle.
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
22_DJD2_OM_EN_USC_t.book Page 214
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