STARTING AND OPERATING 193
DIESEL EXHAUST FLUID
Your vehicle is equipped with a Selective Catalytic
Reduction (SCR) system to meet diesel emissions
standards required by the Environmental
Protection Agency.
The purpose of the SCR system is to reduce levels
of oxi
des of nitrogen (NO
x
) emitted from engines
that are harmful to our health and the environment
to a near-zero level. A small quantity of Diesel
Exhaust Fluid (DEF) is injected into the exhaust
upstream of a catalyst where, when vaporized,
converts smog-forming NO
x
into harmless nitrogen
(N
2
) and water vapor (H
2
O), two natural
components of the air we breathe.
DIESEL EXHAUST FLUID STORAGE
Diesel Exhaust Fluid (DEF) is considered a very
stable product with a long shelf life. If DEF is kept
in temperatures between 10° and 90°F (-12° and
32°C), it will last a minimum of one year.
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 Diesel Exhaust Fluid (DEF) gauge (located on
the instrument cluster) will display the level of DEF
remaining in the tank
Ú page 101.
NOTE:
Driving conditions (altitude, vehicle speed, load,
etc.) will effect the amount of DEF that is used in
your vehicle.
Outside temperature can affect DEF consump-
tion. In cold conditions, 12°F (-11°C) and
below
, the DEF gauge may take longer to
operate as intended. 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.
Diesel Exhaust Fluid (DEF) Fill Procedure
NOTE:
For the correct fluid type Ú page 438.
1. R
emove cap from Diesel Exhaust Fluid (DEF)
tan
k which is located next to the diesel fuel
filler.
DEF Filler Cap And Fuel Fill
2. Insert DEF fill adapter/nozzle into DEF tank
fil
ler neck.
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
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
4
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