Diesel Exhaust Fluid (DEF) Warning Messages
Your vehicle will begin displaying warning messages when the DEF level reaches a
driving range of approximately 200 miles (322 km). If the following warning message
sequence is ignored, your vehicle may be limited to a maximum speed of 5 MPH
(8 km/H) unless DEF is added.
• DEF Low Refill Soon — This message will display when the low level is reached,
during vehicle start up, and with increased frequency during vehicle operation. It
will be accompanied by a single chime. Approximately 5 gallons (19 Liters) of DEF
is required to refill the tank when this message is initially displayed. on pickup
applications, and approximately 7 gallons (28 Liters) are required on chassis-cab
applications.
• Speed Limited to 5 MPH in XXX mi Refill DEF — This message will continuously
display if the “DEF Low Refill Soon” message is ignored, and the frequency of
occurance of the chime will increase unless up to 2 gallons (7.5 Liters) of DEF is
added to the tank.
• 5 MPH Max Speed on Restart, Long Idle or Refuel Refill DEF — This message will
continuously display when the counter reaches zero, and will be accompanied by
a periodic chime.
The vehicle will only be capable of a maximum speed of 5 MPH upon the first of the
following conditions to occur:
• If the vehicle is shutoff and restarted.
• If the vehicle is idled for an extended period of time, approximately one hour
or greater.
• If the system detects that the level of fuel in the tank has increased.
Add a minimum of 2 gallons (9.5 Liters) of DEF to the tank in order to avoid vehicle
operation at a maximum speed of 5 MPH (8 km/H).
NOTE:
A minimum of 2 gallons (9.5 Liters) may be required to restore normal vehicle
operation. Although the vehicle will start normally and can be placed in gear after this
message has been initially displayed, extreme caution should be utilized since the
vehicle will only be capable of maneuvering at a maximum speed of 5 MPH (8 km/H).
6.7L CUMMINS DIESEL
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