ADDING DIESEL EXHAUST
FLUID (DEF)
The DEF gauge (located in the instrument
cluster) will display the level of DEF
remaining in the tank.
Completely fill the DEF tank through the
diesel exhaust fluid fill location at every
maintenance interval, or before if prompted
by the instrument cluster display.
NOTE:
Take caution not to overfill the DEF tank.
The DEF tank on these vehicles is designed
with a large amount of full reserve. So, the
level sensor will indicate a full reading even
before the tank is completely full. To put it
another way, there’s additional storage
capacity in the tank above the Full mark
that’s not represented in the gauge. You may
not see any movement in the reading – even
after driving up to 200 miles (322 km) in
some cases.
NOTE:
• Driving conditions (altitude, vehicle speed,
load, etc.) will affect the amount of DEF
that is used in your vehicle.
• Outside temperature can affect DEF
consumption. In cold conditions, 12°F
(-11°C) and below, the DEF gauge needle
can stay on a fixed position and may not
move for extended periods of time. This is
a normal function of the system.
• Because 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 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
spilling diesel fuel into the DEF Filler.
AUTOMATIC “SMART”
EXHAUST BRAKE – (DIESEL
ONLY)
• Automatic Exhaust Brake technology
delivers smoother, less aggressive exhaust
braking characteristics during downhill
descents. 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
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