Fault Code 1431
Cummins
Oil Pressure Sensor Electrical Fault
Controller displays Fault Code 1431 – Oil Pressure Sensor Circuit Fault
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted oil pressure sensor wiring, Failed oil pressure sensor, Poor connector contact at ECM or sensor
How to Fix / Troubleshooting
Safety first: Disable automatic start. Allow engine to cool before working near the sensor.
- Inspect wiring: Trace the harness from the oil pressure sensor to the ECM. Look for abrasions, pinched sections, or oil contamination.
- Connector check: Disconnect and inspect the sensor connector for bent pins or corrosion. Clean and reconnect firmly.
- Sensor replacement: If wiring is intact and the fault persists, replace the oil pressure sensor with a genuine Cummins part.
- Verify actual pressure: If possible, confirm oil pressure with a mechanical gauge to ensure the engine is safe to run.
- Reset: Clear the fault and monitor readings during a test run.
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Repair Difficulty
Medium
3/5
Required Part
Oil Pressure Sensor
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