Cummins fault code 257 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Engine Fuel Shutoff Valve Driver – Mechanical System Not Responding Properly Or Out Of Adjustment condition (PID S017, SPN 632, FMI 7/7, 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.
Cummins fault code 257 overview
Cummins defines this code as “ENGINE FUEL SHUTOFF VALVE DRIVER – MECHANICAL SYSTEM NOT RESPONDING PROPERLY OR OUT OF ADJUSTMENT” on the Engine Fuel Shutoff Valve. Voltage is supplied to the fuel shutoff valve by the electronic control module (ECM) while the engine keyswitch is ON. While the keyswitch is turned OFF, the voltage to the fuel shutoff valve is turned off by the ECM. The fuel shutoff valve closes and stops fuel from flowing to the fuel system. Component location: The fuel shutoff valve is located on the fuel system. Read the code with a diagnostic tool, confirm it is active, and follow the numbered troubleshooting steps before replacing any component.
Shop talk notes: Verify the electronic control module (ECM) calibration is correct. If necessary, calibrate the ECM. Upon turning the key switch OFF, the ECM turns off the voltage supplied to keep the fuel shutoff valve open.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Engine Fuel Shutoff Valve — ISM CM871 fault codes |
| Fault code | 257 (SPN 632, FMI 7/7) |
| 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
- Component Location
- 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 257. 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 Cummins fault code 257 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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