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Cummins ISC CM2150 (2007-09) Fault Code: 1881 PID: SID 324 SPN: 3251 FMI: 4 Aftertreatment Particulate Filter Differential Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or open circuit detected at the aftertreatment differential pressure sensor circuit.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Possible causes:

1)Signal circuit open or shorted to ground in the engine harness or sensor
2)Supply line open or shorted to ground.

Possible reapirs:

1)Replace the aftertreatment diesel particulate filter differential pressure sensor.
2)The removal and installation of the connector may correct the fault.
3)Repair or replace the OEM harness.