Cummins ISB4.5 CM2150 Fault Code: 418 PID: 97 SPN: 97 FMI: 0 Water-in-Fuel Indicator – Data Valid But Above Normal Operating Range – Least Severe Level.

Posted by PerDiezel Solutions on January 20, 2026

Circuit Description
The water-in-fuel sensor is attached to the fuel filter. The electronic control module (ECM) provides a 5 volt reference signal to the water-in-fuel sensor. When the water collected in the fuel filter covers the sensor probes, the water-in-fuel sensor pulls the 5-VDC reference voltage to ground, indicating high water accumulation in the fuel filter.

Component Location
The water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes
The ECM detects that water in the fuel filter is above the sensor level.

Action Taken When the Fault Code is Active
-The ECM illuminates the flashing amber MAINTENANCE light immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code
The ECM will turn off the flashing amber MAINTENANCE light and the fault code will go inactive immediately after the water has been drained from the fuel filter.

Shop Talk
This fault code indicates that water has been detected in the water separation fuel filter. Drain the water from the fuel filter.

If this fault code is active and there is no water in the fuel filter, a malfunctioning Water-In-Fuel sensor is a likely cause.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

Cummins ISB4.5 CM2150 Fault Code: 415 PID: 100 SPN: 100 FMI: 1 Engine Oil Rifle Pressure – Data Valid but Below Normal Operating Range – Most Severe Level.

Cummins ISB4.5 CM2150 Fault Code: 386 PID: SID 212 SPN: 3509 FMI: 3 Sensor Supply 1 Circuit – Voltage Above Normal or Shorted to High Source.

Cummins ISB4.5 CM2150 Fault Code: 358 PID: SID 254 SPN: 132 FMI: 2 Engine Intake Air Mass Flow Circuit – Data Erratic, Intermittent, or Incorrect.

Cummins ISB4.5 CM2150 Fault Code: 357 PID: 132 SPN: 132 FMI: 4 Engine Intake Air Mass Flow Circuit – Voltage Below Normal or Shorted to Low Source.

Cummins ISB4.5 CM2150 Fault Code: 356 PID: SPN: 132 FMI: 3 Engine Intake Air Mass Flow Sensor Circuit – Voltage Above Normal or Shorted to High Source.

Cummins ISB4.5 CM2150 Fault Code: 352 PID: SID 212 SPN: 3509 FMI: 4 Sensor Supply 1 Circuit – Voltage Below Normal or Shorted to Low Source.

WARNING!