Dodge RAM 2500 2022, Owner'S Manual

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224 STARTING AND OPERATING
System Overview
This vehicle is equipped with a Diesel Exhaust Fluid
(DEF) injection system and a Selective Catalytic
Reduction (SCR) catalyst to meet the emission
requirements.
The DEF injection system consists of the following
components:

DEF tank

DEF pump

DEF injector

Electronically-heated DEF lines

DEF control module

NOx sensors

Temperature sensors

SCR catalyst

UQS Sensor
For system messages and warnings
Ú
page 109.
NOTE:

Your vehicle is equipped with a DEF injection
system. You may occasionally hear an audible
clicking noise. This is normal operation.

The DEF pump will run for a period of time after
engine shutdown to purge the DEF system. This
is normal operation.
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°F and 90°F
(-12°C and 32°C), it will last a minimum of one
year.
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 109.
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 468.
Remove cap from DEF tank (located on drivers side
of the vehicle or in fuel door).
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