The fault code 418 DTCs troubleshooting manual is the official Cummins diagnostic procedure for the water-in-fuel indicator circuit on the ISX11.9 CM2250 engine platform. The water-in-fuel sensor is attached to the fuel filter and receives a 5-volt reference from the ECM; when water collected in the filter covers the sensor probes the ECM raises this indicator. This 6-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | water-in-fuel indicator circuit, DTCs |
| Fault code reference | Fault Code 418 — SPN 97, FMI 0 |
| Warning lamp | a maintenance lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 6 |
| File size | 0.18 MB |
| Format | |
| Language | English |
fault code 418 DTCs document contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and possible causes
- Associated Procedures table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 418 (SPN 97, FMI 0), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
This is the least-severe maintenance-level warning and no engine derate is applied, but the fuel filter and water separator must be drained promptly. Shop Talk in the document lists the most likely causes:
- Water collected in the fuel filter or water separator
- A fuel filter that has not been drained on schedule
Who needs the fault code 418 DTCs manual
Diesel technicians and workshop owners diagnosing Fault Code 418 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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