display and countdown as the vehicle is
driven. Other information can be accessed
with the scroll switches on the steering
wheel. However, the countdown will return
to the display after a short interval. Chimes
will sound at various mileage intervals
during the countdown to serve as a
reminder of the low DEF level. If the count
-
down reaches zero, indicating the DEF
tank is nearly empty, the message “5 MPH
Max Speed on Restart, Long Idle or Refuel
- Refill DEF” will be displayed. Add up to
2.5 Gallons (9.5 Liters) of DEF in order to
avoid vehicle operation limited at a
maximum speed of 5 mph (8 km/h).
Tampering / Incorrect DEF Detection
In alignment with Clean Air Act (CAA) guide
-
lines, the SCR system will detect conditions
which may be due to tampering or incorrect
DEF. A string of warning messages will
display in the instrument cluster:
• Service DEF System – See Dealer
• 5 mph Max Speed in 200 mi Service DEF
System – See Dealer
• 5 mph Max Speed on Restart, Long Idle or
Refuel – Service DEF System – See Dealer
• 5 mph Max Speed Service DEF System –
See Dealer
A visit to an authorized dealer should be
planned as soon as you see one of these
messages to correct the issue and to avoid
vehicle operation being limited to a
maximum speed of 5 mph (8 km/h). Under
some conditions, such as in the case of
recurring faults, the countdown may start
from a value less than 200 miles (322 km).
Only fill the DEF tank with API-certified DEF,
other fluids may cause damage to the emis
-
sions components.
Diesel Fuel Fill:
Your truck is equipped with a capless diesel
fuel filler system. The diesel nozzle must be
fully inserted or fill performance will be
greatly reduced.
Miscellaneous DEF Tips:
• Never “top-off” the DEF tank after a
normal DEF fill.
• Containers and pumps containing iron,
brass, aluminum, or non-stainless steel
will rapidly corrode if used to store or
transfer DEF. The resulting corrosion can
damage emissions components.
• If stored at temperatures below 90°F
(32°C), DEF has a shelf life of at least one
year. However, DEF degrades more rapidly
at higher temperatures.
• You may occasionally hear an audible
clicking from the DEF system. This is
normal operation.
• The sealed bottles and vented fill adapters
available from your RAM dealer are
designed to ensure proper filling.
Non-sealed bottles and/or non-vented fill
adapters, may be available from other
sources will and require special care to
avoid overfilling.
• If DEF is spilled, it should be cleaned up
with mild soap and water to avoid corro
-
sion or damage to components and
finished surfaces. For this reason, trans
-
porting DEF in the cab of your truck is not
recommended.
• You can receive assistance in locating DEF
by calling 1-866-RAM-INFO.
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