The HEST Lamp illuminates to indicate that high exhaust temperatures may exist due to
aftermarket regeneration. This is normal and does not signify the need for any kind of
vehicle service or engine service. When this lamp is illuminated, ensure that the exhaust
pipe outlet is not directed at any combustible surface or material. Reference your Cummins
Owners Manual for complete instructions.
Aftertreatment Diesel Particulate Filter (DPF) Lamp
Illuminated
The Aftertreatment DPF Lamp indicates, when illuminated or flashing, that the
Aftertreatment DPF requires regeneration. This is accomplished by the following:
1.
If the vehicle is equipped with a Regeneration Inhibit Switch, ensure that the switch is
not in the Inhibit position.
2.
Perform a DPF regeneration by one of the following methods:
a. Change to a more challenging duty cycle - such as highway driving - for at least 20
minutes to increase exhaust temperatures - OR
b. Perform a parked regeneration.
Flashing
If a regeneration is not performed in a timely manner after the DPF Lamp is illuminated, the
DPF Lamp will begin to flash. This indicates a higher level of PM in the DPF. In addition,
engine power may be reduced automatically.
Flashing With Check Engine Lamp / Amber Warning Lamp
If flashing DPF Lamp combined with an illuminated Check Engine Lamp / Amber Warning
Lamp indicates that the aftertreatment DPF needs regeneration immediately. Engine power
will be reduced automatically. A parked regeneration is required.
Stop Engine Lamp
If a parked regeneration is not performed, the red Stop Engine Lamp will illuminate. As
soon as it is safe to do so, the vehicle should be stopped. It should then be taken to an
authorized Cummins location for repair.
Regeneration Inhibit Switch
The purpose of this switch is to prevent or disable aftertreatment DPF regeneration.
Reference the vehicle Owners Manual for complete operation and use of this switch.
215P/N 12261-683 REVISED: January 2015
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