RAM RAM 2500, Quick Reference Manual

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trucks, it is located behind the cab on the
driver’s side of the truck. On Pickup trucks, the
blue filler cap is located inside the fuel filler
door. When refilling the DEF tank, make sure
the fluid used carries the API certification logo
for Diesel Exhaust Fluid.
Low DEF Warning
When the DEF level is low, a message stating
“Low DEF Refill Soon” will be displayed in the
instrument cluster, the “Low DEF Icon” will
illuminate, and a chime will sound. Unless DEF
is added, a mileage countdown will be indi-
cated with the message “Speed Limited to
5 MPH in 200 Miles - Refill DEF”. This mes-
sage will be updated and displayed at each
startup.
When the countdown reaches
100 miles (160 km), the message will remain
on the display and countdown as the vehicle is
driven. Other information can be accessed with
the scroll switches on the steering wheel. How-
ever, 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 countdown 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 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 at
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 emissions 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.