Cummins ISB CM850 (2003-06) Fault Code: 141 (Auto) PID: 100 SPN: 100 FMI: 4 Oil Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the engine oil pressure circuit

Posted by PerDiezel Solutions on January 18, 2026

The oil pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 141, check for multiple faults.

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 repairs:

1)Replace the oil pressure sensor.
2)Replace the ECM.
3)Replace the engine harness.

Cummins ISB CM850 (2003-06) Fault Code: 135 (Marine) PID: 100 SPN: 100 FMI: 3 Oil Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the engine oil pressure circuit.

Cummins ISB CM850 (2003-06) Fault Code: 135 (Auto) PID: 100 SPN: 100 FMI: 3 Oil Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the engine oil pressure circuit.

Cummins ISB CM850 (2003-06) Fault Code: 134 PID: 29 SPN: 974 FMI: 4 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected at remote accelerator pedal position signal.

Cummins ISB CM850 (2003-06) Fault Code: 133 PID: 29 SPN: 974 FMI: 3 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal, or shorted to High Source. High voltage detected at remote accelerator pedal position circuit.

Cummins ISB CM850 (2003-06) Fault Code: 132 PID: 91 SPN: 91 FMI: 4 Accelerator Pedal or Lever Position Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at accelerator pedal or lever position signal circuit.

Cummins ISB CM850 (2003-06) Fault Code: 131 PID: 91 SPN: 91 FMI: 3 Accelerator Pedal or Lever Position Sensor Circuit – Shorted High. High voltage detected at accelerator pedal or lever position circuit.

WARNING!