Cummins ISM Code 259 is the official Cummins fault code troubleshooting PDF that documents the fuel shutoff valve on ISM CM570 (1999-02) engines. This 5-page reference from the Cummins service literature explains the circuit, the likely causes behind the yellow warning lamp, and the step-by-step checks a technician follows to confirm the repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570 and Signature CM570 (1999-02) |
| System / Group | Fuel Shutoff Valve (DTCs) |
| Fault code | Code 259 · PID S017 · SPN 632 · FMI 7/7 |
| Warning lamp | Yellow |
| Year / Revision | Copyright 2017 |
| Pages | 5 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk – possible causes
- Troubleshooting steps
- Fault code verification and clearing
Cummins ISM Code 259 troubleshooting summary
Voltage is supplied to the fuel shutoff valve by the ECM while the engine key switch is ON. When the key switch is OFF, the voltage to the fuel shutoff valve is turned off by the ECM. The fuel shutoff valve is located on the fuel delivery housing, below the air inlet horn. The manual walks through 8 labelled troubleshooting steps that inspect connectors and pins, measure circuit resistance, and verify the fault code is inactive after the repair.
Upon turning the key switch off, the ECM turns off the voltage
supplied to keep the fuel shutoff open. The ECM continues to fire
the fueling and timing actuators as the engine spins down.
Applicable truck models
This procedure applies to Cummins ISM CM570, ISX CM570 and Signature CM570 engines built in the 1999-02 range, as used in Class 8 highway trucks. Always confirm the exact engine dataplate before servicing. Full engine specifications and dealer support are available on the Cummins official website.
Who needs this Cummins ISM Code 259 manual
Heavy-duty diesel technicians, fleet service managers and independent workshop owners diagnosing a Code 259 on the fuel shutoff valve rely on this document to follow the manufacturer procedure instead of guessing at parts. Because Code 259 shares its troubleshooting logic with the ISX CM570 and Signature CM570 platforms, a single PDF supports several Cummins engine families in the same workshop.
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