• Since DEF will begin to freeze at 12°F (-11°C), your vehicle is equipped with an
automatic DEF heating system. This allows the DEF injection system to operate
properly at temperatures below 12°F (-11°C). If your vehicle is not in operation for
an extended period of time with temperatures below 12°F (-11°C), the DEF in the
tank may freeze. If the tank is overfilled and freezes, it could be damaged.
Therefore, do not overfill the DEF tank. Extra care should be taken when filling
with portable containers to avoid overfilling. Note the level of the DEF gauge in
your instrument cluster. On pickup applications, you may safely add a maximum
of 2 gallons (7.5 liters) of DEF from portable containers when your DEF gauge is
reading ½ full. On Chassis Cab applications, a maximum of 2 gallons (7.5 liters)
may be added when the DEF gauge is reading ¾ full.
• There is an electric heater inside the DEF tank that automatically works when
necessary. And if the DEF supply does freeze, the truck will operate normally until
it thaws.
• Ensure the DEF cap is reinstalled prior to filling vehicle with diesel fuel to avoid
spilling diesel fuel into the DEF Filler.
DEF Fill Procedure
1. Remove cap from DEF tank (located behind the fuel door on driver’s side of the
vehicle).
2. Insert DEF container or fill nozzle into
DEF fill location and fill DEF tank.
3. Reinstall cap onto DEF tank.
Refer to the Diesel Supplement at
www.ramtrucks.com/en/owners/manuals
for further details.
Fill Locations
1 — Diesel Exhaust Fluid (DEF)
Fill Location
2 — Diesel Fuel Fill Location
6 . 7 L C U M M I N S D I E S E L
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