ISX 2350

[MommaBurt]

Details for Cummins fault code: 1981
SPN FMI Lamp Color Description
3936 15 Amber Aftertreatment 1 Diesel Particulate Filter System - Data Valid But Above Normal Operating Range - Least Severe Level
Reason
Aftertreatment Diesel Particulate Filter System - Data Valid But Above Normal Operational Range - Least Severe Level. The aftertreatment differential pressure has exceeded the maximum operating limits or the diesel particulate filter is plugged.
Effect
Possible reduced engine performance.
Component Location
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM). Refer to the OEM service manual.
Circuit Description
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter is estimated, using the aftertreatment differential pressure sensor and the calculated soot output of the engine.


Basically, the filter is a little plugged.