Jeep Grand Cherokee 4x2 2019 Supplement Manual page 38

36 STARTING AND OPERATING
NOTE:
• The DEF gauge may take up to five seconds to update
after adding a gallon or more of Diesel Exhaust Fluid
(DEF) to the DEF tank. If you have a fault related to the
DEF system, the gauge may not update to the new
level. See an authorized dealer for service.
• The DEF gauge may also not immediately update after
a refill if the temperature of the DEF fluid is below 12F
(-11C). The DEF line heater will possibly warm up the
DEF fluid and allow the gauge to update after a period
of run time. Under very cold conditions, it is possible
that the gauge may not reflect the new fill level for
several drives.
CAUTION!
• To avoid DEF spillage, and possible damage to the
DEF tank from overfilling, do not "top off" the DEF
tank after filling.
• DO NOT OVERFILL. DEF will freeze below 12ºF
(-11ºC). The DEF system is designed to work in
temperatures below the DEF freezing point, how-
ever, if the tank is overfilled and freezes, the system
could be damaged.
• When DEF is spilled, clean the area immediately
with water and use an absorbent material to soak up
the spills on the ground.
• Do not attempt to start your engine if DEF is acci-
dentally added to the diesel fuel tank as it can result
in severe damage to your engine, including but not
limited to failure of the fuel pump and injectors.
• Never add anything other than DEF to the tank –
especially any form of hydrocarbon such as diesel
fuel, fuel system additives, gasoline, or any other
petroleum-based product. Even a very small amount
of these, less than 100 parts per million or less than 1
oz. (30 ml) per 78 gallons (295 liters) will contaminate
the entire DEF system and will require replacement.
If owners use a container, funnel or nozzle when
refilling the tank, it should either be new or one that
is has only been used for adding DEF. Mopar pro-
vides an attachable nozzle with its DEF for this
(Continued)
purpose.
CAUTION! (Continued)