Common Warning and Indicator Lamps
Lamp Description Color
STOP
STOP Engine
*
Indicates a serious fault that requires engine shutdown
immediately. The engine protection system reduces the
maximum engine torque and speed, and, if the condition
does not improve, shuts down the engine within 30 to 60
seconds.
Safely bring the vehicle to a stop on the side of the road
and shut down the engine as soon as the red light is seen.
IMPORTANT: If the engine shuts down while the vehicle
is in a hazardous location, turn the key to the OFF
position for a few seconds, then restart the engine and
move the vehicle to a safer location.
Red
Low Air Pressure
Indicates air pressure in the primary or secondary reservoir
is below 70 psi (483 kPa).
BRAKE
Parking Brake
Indicates the parking brake is engaged. An audible alert
activates when the vehicle is moving over 2 mph (3 km/h)
with the parking brake set.
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 illuminates.
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 occurs.
Malfunction Indicator
Lamp (MIL)
Indicates an emissions-related fault. See the engine
operation manual for details.
Instruments and Controls Identification
2.3
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