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.