Common Warning and Indicator Lamps
Lamp Description Color
High Coolant Temperature
Indicates the coolant temperature is above the maximum
allowable temperature.
Red
Low Air Pressure
Indicates air pressure in the primary or secondary reservoir
has dropped below approximately 70 psi (483 kPa).
Low Engine Oil Pressure
Indicates the engine oil pressure is below the minimum
allowable pressure.
Transmission Overheat Indicates high transmission temperature.
Parking Brake Indicates the parking brake is engaged.
Low Battery Voltage Indicates that battery voltage is 11.9 volts or less.
Unfastened Seat Belt
Activates with an audible alert when the system detects that
the parking brake is off and the driver seat belt is not
fastened on some vehicles. On other vehicles, this lamp
illuminates for 15 seconds when the ignition is first turned
on.
CHECK
CHECK Engine
*
Indicates an engine condition (low oil pressure, low coolant
level, high coolant temperature, high DPF soot level, or
uncontrolled DPF regeneration) that requires correction.
Correct the condition as soon as possible. If the condition
worsens, the STOP engine lamp will illuminate.
Amber
High Exhaust System
Temperature (HEST)
*
Slow (10-second) flashing indicates a regeneration (regen)
is in progress.
IMPORTANT: When the HEST lamp is illuminated, do
not park the vehicle near flammable material.
Solid illumination indicates high exhaust temperatures at the
outlet of the tail pipe when speed is below 5 mph (8 km/h).
Diesel Particulate Filter
(DPF) Status
Solid illumination indicates a regen is required. Change to a
more challenging duty cycle (such as highway driving ) to
raise exhaust temperatures for at least twenty minutes, or
perform a parked regen.
Blinking indicates that a parked regen is required
immediately. An engine derate and shutdown will occur.
Malfunction Indicator
Lamp (MIL)
Indicates an emissions-related fault. See the engine
operation manual for details.
Instruments
4.5
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