Jeep Grand Cherokee 2018 Manual page 28

Adding Diesel Exhaust Fluid
The DEF gauge (located on the instrument
cluster display) will display the level of DEF
remaining in the tank. Refer to "Instrument Clus-
ter Display" in "Getting To Know Your Instrument
Panel" for further information.
NOTE:
Driving conditions (altitude, vehicle speed, load,
etc.) will effect the amount of DEF that is used in
your vehicle.
DEF Fill Procedure
NOTE:
Refer to "Fluids And Lubricants" in the "Technical
Specifications" section for the correct fluid type.
1. Remove cap from DEF fill inlet (located in
fuel door).
Fuel and Diesel Exhaust Fluid Fill Location
1 — Diesel Fuel Filler
2 — Diesel Exhaust Fluid Filler
24
2. Insert DEF fill adapter/nozzle into DEF fill
inlet.
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 dam-
age 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, however, if the tank is overfilled and
freezes, the system could be damaged.
CAUTION! (Continued)
• When DEF is spilled, clean the area immedi-
ately with water and use an absorbent mate-
rial to soak up the spills on the ground.
• Do not attempt to start your engine if DEF
is accidentally 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 provides an attachable
nozzle with its DEF for this purpose.
3. Stop filling the DEF tank immediately when
any of the following happen: DEF stops
flowing from the fill bottle into the DEF fill
inlet, DEF splashes out the fill inlet, or a DEF
(Continued)
pump nozzle automatically shuts off.
4. Reinstall cap onto DEF fill inlet.