Cummins fault code 428 is the Cummins ISM CM871 (2007-09) diagnostic reference for Water-In-Fuel Indicator Sensor Circuit – Voltage Above Normal, or Shorted to High Source, reported as PID P097, SPN 97, FMI 3/3 with an Amber lamp. This 5-page workshop PDF covers the Water-In-Fuel Sensor Circuit (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 Sensor Circuit (ISX and ISM) / DTCs |
| Fault identifiers | PID P097, SPN 97, FMI 3/3, Amber lamp |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 5 |
| File size | 0.30 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 428
The water-in-fuel sensor is attached to the fuel filter, and the ECM feeds it a 5-VDC reference signal; when collected water covers the sensor probes the sensor pulls that reference voltage to ground to signal high water accumulation.
The Cummins Shop Talk section advises confirming the ECM calibration is correct and recalibrating if necessary. Documented possible causes include:
- an open return or signal circuit in the harness, connectors, or sensor
- a signal wire shorted to sensor supply or battery voltage
Component location manual information
The water-in-fuel sensor is integrated into the bottom of the OEM-supplied suction fuel filter on the intake side of the engine.
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 428 manual
Fleet technicians, independent diesel mechanics and workshop owners diagnosing an active water-in-fuel sensor circuit 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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