RAM RAM 2500, Quick Reference Manual

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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 neces-
sary 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 spill-
ing diesel fuel into the DEF Filler.
AUTOMATIC “SMART” EXHAUST BRAKE
– (DIESEL ONLY)
• Automatic Exhaust Brake technology deliv-
ers smoother, less aggressive exhaust brak-
ing characteristics during downhill de-
scents. Although it can apply full exhaust
braking force if needed, Automatic Exhaust
Brake may not apply obvious braking if the
vehicle speed is not increasing. Automatic
Exhaust Brake is intended to maintain ve-
hicle speed while Full Exhaust Brake is in-
tended to reduce vehicle speed.
• Automatic Exhaust Brake can be enabled by
pushing the exhaust brake button again any
time after the normal Full Exhaust Brake has
been turned on. The “Exhaust Brake Indica-
tor” in the instrument cluster will change
from yellow to green when Automatic Ex-
haust Brake is enabled. Pushing the exhaust
brake button again will toggle the exhaust
brake mode to off.