Dodge RAM 1500 2018 Diesel Supplement page 115

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.
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 accompanied 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
continuously display until the mileage counter reaches
zero, and will be accompanied by a periodic chime. The
GETTING TO KNOW YOUR INSTRUMENT PANEL 113
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).
• 5 MPH Max Speed on Restart, Long Idle or Refuel
Service DEF See Dealer — This message will continu-
ously display when the mileage 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.
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