Cummins fault code 418 is the Cummins ISM CM871 (2007-09) diagnostic reference for Water-In-Fuel Indicator – Data Valid But Above Normal Operational Range – Least Severe Level, reported as PID P097, SPN 97, FMI 0/15 with an Maintenance lamp. This 2-page workshop PDF covers the Water-In-Fuel Indicator (ISX and ISM), giving the fault description, shop-talk notes, component location and the step-by-step troubleshooting tree. It is compiled from the TruckFaultCodes.com fault-code library (Copyright © 2017).
Official document details — Cummins fault code
| Brand | Cummins |
| Model coverage | ISM and ISX CM871 (2007-09) engines |
| System / Group | Water-In-Fuel Indicator (ISX and ISM) / DTCs |
| Fault identifiers | PID P097, SPN 97, FMI 0/15, Maintenance lamp |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 2 |
| File size | 0.09 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Reading Cummins fault code 418
The water-in-fuel sensor is attached to the fuel filter and the ECM supplies it a 5-VDC reference; this maintenance code indicates water has been detected in the water-separating fuel filter and the water should be drained.
The Cummins Shop Talk section advises confirming the ECM calibration is correct and recalibrating if necessary. Documented possible causes include:
- water collected in the water-separating fuel filter that needs to be drained
Component location manual information
The water-in-fuel sensor is integrated into the bottom of the OEM-supplied suction fuel filter.
Applicable truck models
This document applies to Cummins ISM CM871 (2007-09) engines, and the same circuit description is shared with the ISX CM871 platform where noted in the extract. These engines power many Class 8 highway tractors and vocational trucks built by North American OEMs. Confirm the exact ECM calibration and OEM wiring against the manufacturer records; full engine support is published by Cummins official engine support.
Who needs this Cummins fault code 418 manual
Fleet technicians, independent diesel mechanics and workshop owners diagnosing an active water-in-fuel indicator condition will use this sheet to follow the correct troubleshooting order instead of replacing parts on guesswork.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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