Diesel Exhaust Fluid (Def) Warning Messages - Jeep Grand Cherokee 2018 Manual

Your vehicle has the ability to alert you to
additional maintenance required on your vehicle
or engine. Refer to the following messages that
may be displayed on your instrument cluster
display:
• Exhaust Filter Nearing Full Safely Drive at
Highway Speeds to Clear — This message
will be displayed if the exhaust particulate
filter reaches 80% of its maximum storage
capacity. Under conditions of exclusive short
duration and low speed driving cycles, your
diesel engine and exhaust after-treatment
system may never reach the conditions re-
quired to cleanse the filter to remove the
trapped PM. If this occurs, the "Exhaust Filter
XX% Full Safely Drive at Highway Speeds to
Remedy" message will be displayed. If this
message is displayed, you will hear one
chime to assist in alerting you of this condi-
tion. By simply driving your vehicle at high-
way speeds for up to 20 minutes, you can
remedy the condition in the particulate filter
system and allow your diesel engine and
exhaust after-treatment system to cleanse
the filter to remove the trapped PM and
restore the system to normal operating con-
dition.
• Exhaust System Regeneration in Process
Continue Driving — This message indicates
that the Diesel Particulate Filter (DPF) is
self-cleaning. Maintain your current driving
condition until regeneration is completed.
• Exhaust System — Regeneration Com-
pleted — This message indicates that the
Diesel Particulate Filter (DPF) self-cleaning is
completed. If this message is displayed, you
will hear one chime to assist in alerting you of
this condition.
• Exhaust System Service Required — See
Dealer — This messages indicates regenera-
tion has been disabled due to a system malfunc-
tion. At this point the engine Powertrain Control
Module (PCM) will register a fault code, the
instrument panel will display a MIL light.
CAUTION!
See your authorized dealer, as damage to
the exhaust system could occur soon with
continued operation.
• Exhaust Filter Full — Power Reduced See
Dealer — This message indicates the PCM
has derated the engine to limit the likelihood
of permanent damage to the after-treatment
system. If this condition is not corrected and a
dealer service is not performed, extensive
exhaust after-treatment damage can occur.
To correct this condition it will be necessary to
have your vehicle serviced by your local
authorized dealer.
NOTE:
Failing to follow the oil change indicator, chang-
ing your oil and resetting the oil change indicator
by 0 miles remaining will prevent the diesel
exhaust filter from performing it's cleaning rou-
tine. This will shortly result in a Malfunction
Indicator Light (MIL) and reduced engine power.
Only an authorized dealer will be able to correct
this condition.
CAUTION!
See your authorized dealer, as damage to
the exhaust system could occur soon with
continued operation.
Diesel Exhaust Fluid (DEF) Warning
Messages
Your vehicle will begin displaying warning mes-
sages when the DEF level reaches a driving
range of approximately 500 miles. If the follow-
ing warning message sequence is ignored, your
vehicle may not restart unless DEF is added
within the displayed mileage shown in the mes-
sage.
• Engine Will Not Restart in XXXX mi DEF
Low Refill Soon — This message will dis-
play when DEF driving range is less than
500 miles, DEF fluid top off is required with in
the displayed mileage. The message will be
displayed during vehicle start up with the
current allowed mileage and accompanied by
a single chime. The remaining mileage can
be pulled up anytime by way of the "Mes-
sages" list within the display.
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