Cummins ISB6.7 CM2150 (2007-09) Fault Code: 298 PID: 443 SPN: 1388 FMI: 4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or open circuit detected at the OEM pressure 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 OEM harness or sensor
2)Supply line open or shorted to ground.

Possible repairs:

1)Replace the OEM pressure sensor.
2)Repair or replace the OEM harness.
3)Replace the ECM.