Cummins ISB CM850 (2003-06) Fault Code: FC0001 PID: SPN: FMI: Exhaust Gas Pressure Sensor Number 1 Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the Exhaust Gas Pressure Sensor circuit.

Posted by PerDiezel Solutions on January 18, 2026

Possible causes:

1)Open return circuit in the harness, connectors, or sensor
2)Signal circuit shorted to sensor supply or battery voltage.
This fault code will only be present in the exhaust gas treatment monitor unit and will not be present in the engine electronic control module (ECM). The exhaust gas treatment fault code and maintenance lamps will both flash one time in sequence to alert the operator that this condition exists. The engine diagnostic lamps will not illuminate.

Possible repairs:

1)Replace the exhaust gas pressure sensor.
2)Repair or replace the exhaust gas treatment monitor harness
3)Replace the exhaust gas treatment monitor unit.

Cummins ISL CM850 (2003-06) Fault Code: 2976 PID: SPN: 3361 FMI: 2 Dosing Control Unit Temperature – Data Erratic, Intermittent, or Incorrect. An internal error has been detected in the catalyst dosing control unit.

Cummins ISL CM850 (2003-06) Fault Code: 2973 PID: 102 SPN: 102 FMI: 2 Intake Manifold Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect. The electronic control module (ECM) has detected an intake manifold pressure signal that is too high or too low for present engine operating conditions.

Cummins ISL CM850 (2003-06) Fault Code: 2964 PID: 105 SPN: 105 FMI: 15 Intake Manifold Temperature High – Data Valid But Above Normal Operating Range – Least Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection warning limit.

Cummins ISL CM850 (2003-06) Fault Code: 2963 PID: 110 SPN: 110 FMI: 15 Engine Coolant Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level. Engine coolant temperature signal indicates coolant temperature is above the engine coolant temperature engine protection warning limit.

Cummins ISL CM850 (2003-06) Fault Code: 2962 PID: 412 SPN: 412 FMI: 0 EGR Temperature – Data Valid But Above Normal Operating Range, Moderately Severe Level.

Cummins ISL CM850 (2003-06) Fault Code: 2961 PID: 412 SPN: 412 FMI: 15 Exhaust Gas Recirculation (EGR) temperature – Data Valid but Above Normal Operating Range, Least Severe Level.

WARNING!