Jeep Grand Cherokee 2018 Quick Reference Manual page 13

• DEF consumption varies with vehicle usage
in much the same way as diesel fuel does -
under most driving conditions, your DEF
tank will have a range of 10,000 miles
(16093 km) or more.
• Your vehicle has been delivered to you with a
full tank of DEF and it is recommended that
it is re-filled by your authorized Jeep dealer
at every regular oil change interval of
10,000 miles (16093 km).
• A DEF level gauge can be accessed at any
time within the instument cluster display.
• Should you run your vehicle out of DEF, a
minimum of 2 gallons (7.6 liters) of DEF is
required for the vehicle to re-start. The DEF
filler is located within the fuel-filler housing,
is adjacent to the diesel fuel-filler neck and
has a blue screw-on cap. Only fill the DEF
tank with API-certified DEF fluid.
• 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 your authorized dealer for service.
• The DEF gauge may also not immediately
update after a refill if the temperature of the
DEF fluid is below 12°F (-11°C). 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 condi-
tions, it is possible that the gauge may not
reflect the new fill level for several drives.
• Should your DEF level become low enough to
limit your vehicle's ability to operate, a series
of increasing warning messages will be dis-
played in the instrument cluster. For a com-
plete listing of DEF level warnings and mes-
sages, please see your Diesel Supplement.
• A "Service DEF - See Dealer" message is not
DEF level related. It is used to indicate the
SCR system is not functioning properly due
to poor-quality DEF or other reasons. If not
corrected by an authorized dealer, it will
limit the vehicle's ability to operate.
NOTE:
Never allow DEF to be added to the diesel fuel
tank. Do not attempt to start your engine if DEF
is accidentally added to the diesel fuel tank as
it will result in severe damage to your engine.
Never "top-off' the DEF tank after a normal DEF
fill. If DEF is spilled, it should be cleaned with
mild soap and water to prevent corrosion or
damage to components and finished surfaces.
For further information, and applicable warn-
ings and cautions, please refer to the Owner's
Manual at www.mopar.com/en-us/care/owners-
manual.html (U.S. Residents)
www.owners.mopar.ca (Canadian Residents).
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