fault code 255 DTCs is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Engine Fuel Shutoff Valve Driver Circuit – Voltage Above Normal Or Shorted To High Source condition (PID S017, SPN 632, FMI 3/3, Amber lamp). This 5-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
fault code 255 DTCs overview
Cummins defines this code as “ENGINE FUEL SHUTOFF VALVE DRIVER CIRCUIT – VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE” on the Engine Fuel Shutoff Valve Driver Circuit. The fuel shutoff valve is a device used by the electronic control module (ECM) to control the engine fuel supply. When the ECM energizes the engine fuel shutoff valve driver circuit, the engine fuel shutoff valve is opened. Zero voltage to the engine fuel shutoff valve will close the engine fuel shutoff valve. The engine fuel shutoff valve driver circuit utilizes a pulse width modulated (PWM) signal. A PWM signal is a pulsed voltage signal between 0-VDC and system voltage.
According to the shop talk notes, possible causes include:
- Open circuit in the engine harness, connectors, or shutoff valve.
- Fuel shutoff valve signal wire shorted to a voltage source in the harness.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Engine Fuel Shutoff Valve Driver Circuit — ISM CM871 fault codes |
| Fault code | 255 (SPN 632, FMI 3/3) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 5 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 255. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this fault code 255 DTCs manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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