Dodge RAM 2500 2022 Owner's Manual page 121

When the DEF system needs to be serviced the
following warnings will display:
DEF Low Refill Soon — This message will display

when the low level is reached, during vehicle
start-up, and with increased frequency during
vehicle operation. It will be accompanied by a
single chime. Approximately 5 gallons (19
Liters) of DEF is required to refill the tank when
this message is initially displayed. on pickup
applications, and approximately 7 gallons (26
Liters) are required on chassis-cab applications.
Speed Limited to 5 MPH in XXX mi Refill DEF —

This message will continuously display if the
"DEF Low Refill Soon" message is ignored, and
the frequency of occurrence of the chime will
increase unless up to 2 gallons (7.5 Liters) of
DEF is added to the tank.
5 MPH Max Speed on Restart, Long Idle or

Refuel Refill DEF — This message will continu-
ously display when the counter reaches zero,
and will be accompanied by a periodic chime.
The vehicle will only be capable of a maximum
speed of 5 mph upon the first of the following
conditions to occur:
If the vehicle is shutoff and restarted.

If the vehicle is idled for an extended period

of time, approximately one hour or greater.
If the system detects that the level of fuel in

the tank has increased.
Add a minimum of 2 gallons (7.5 Liters) of DEF
to the tank in order to avoid vehicle operation at
a maximum speed of 5 mph (8 km/h).
NOTE:
A minimum of 2 gallons (7.5 Liters) may be
required to restore normal vehicle operation.
Although the vehicle will start normally and can be
placed in gear after this message has been initially
displayed, extreme caution should be utilized since
the vehicle will only be capable of maneuvering at
a maximum speed of 5 mph (8 km/h).
Diesel Exhaust Fluid (DEF) Fault Warning
Messages
There are five different messages which are
displayed if the vehicle detects that the DEF
system has been filled with a fluid other than DEF,
has experienced component failures, or when
tampering has been detected. The vehicle may be
limited to a maximum speed of 5 mph (8 km/h) if
the DEF system is not serviced within less than
200 miles (322 km) of the fault being detected.
GETTING TO KNOW YOUR INSTRUMENT PANEL
When the DEF system needs to be serviced the
following warnings will display:
Service DEF System See Dealer — This message

will display when the fault is initially detected,
each time the vehicle is started, and periodically
during driving. The message will be accompa-
nied by a single chime. We recommend you
drive to your nearest authorized dealer and
have your vehicle serviced as soon as possible.
5 MPH Max Speed in 150 mi Service DEF

System See Dealer — This message will display
if the DEF system has not been serviced after
the "Service DEF System – See Dealer"
message is displayed. This message will contin-
uously display until the mileage counter reaches
zero, and will be accompanied by a periodic
chime. The message will continue to countdown
until it reaches zero unless the vehicle is
serviced. We recommend you drive to your
nearest authorized dealer and have your vehicle
serviced immediately.
NOTE:
Under some circumstances this mileage counter
may start with a value of less than 150 miles
(241 km). For example, if recurring faults are
detected in a time interval of less than 40 hours,
the counter may restart at the value where it
stopped when a previous fault was temporarily
remedied, or at a minimum of 50 miles (80 km).
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