Cold Ambient Derate Mode Messages
The vehicle will display messages when a derate (engine
power reduction) is activated to protect the turbocharger
during engine start up in cold ambient temperatures.
• Engine Power Reduced During Warmup — This mes-
sage will display during start up when the ambient
temperature is between 10° F (-12° C) and -10° F (-23° C).
• Engine Power Reduced Up To 30 Sec (Seconds) During
Warmup — This message will display during start up
when the ambient temperature is between -10° F (-23° C)
and -25 F (-32° C).
• Engine Power Reduced Up To 2 Min (Minutes) During
Warmup — This message will display during start up
when the ambient temperature is -25° F (-32° C) and
below.
• Coolant Low — This telltale will turn on to indicate the
vehicle coolant level is low. See “Adding Coolant” under
the section “Maintaining Your Vehicle” for more infor-
mation.
Diesel Exhaust Fluid (DEF) Warning Messages
Your vehicle will begin displaying warning messages when
the DEF level reaches a driving range of approximately
350 miles (560 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:
116 UNDERSTANDING YOUR INSTRUMENT PANEL
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