Cummins ISM CM875 (2003-06) Fault Code: 143 PID: P100 SPN: 100 FMI: 1/18 Engine Oil Rifle Pressure – Data Valid But Below Normal Operating Range – Moderately Severe Level.

The engine oil pressure sensor measures the pressure of the oil in the oil rifle on the left-hand side of the engine block.

Possible causes:

1)Mechanical failures such as lubricating oil pump, lubricating oil high pressure relief valve, loose lubricating oil filter
2)Breakdown or contamination of the lubricating oil
3)Plugged lubricating oil filter.