Cummins Generator Error Code 259: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
259
Brand
Cummins
Product Type
generator
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Cummins generator error code 259 indicates a problem with the engine fuel shutoff valve. This valve controls fuel flow to the engine; when it malfunctions, the generator may fail to start or run. This guide helps you diagnose and fix the issue safely.
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Tools You'll Need

How to Fix Error Code 259

  1. Safety First: Disconnect Power and Fuel

    Fuel is flammable. Do not smoke or create sparks. Wear safety glasses and gloves.

  2. Locate the Fuel Shutoff Valve

  3. Check Electrical Connections

  4. Test the Solenoid with a Multimeter

  5. Apply Direct Power to Test Solenoid Operation

    Be careful when testing with power on. Avoid shorting terminals.

  6. Inspect Fuel Lines and Valve for Blockage

    Fuel may spill. Have a rag ready and properly dispose of any fuel.

  7. Replace Faulty Fuel Shutoff Valve

    Use only recommended replacement parts to ensure safety and compatibility.

  8. Test the Generator

Parts You May Need

Fuel shutoff solenoid
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Fuel shutoff solenoid
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Fuel shutoff solenoid
Check Price on Amazon
Fuel shutoff solenoid
Check Price on Amazon
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When to Call a Professional

If testing shows voltage at the solenoid but no operation, and replacing the solenoid doesn't fix the issue, the problem may be in the ECM or wiring harness. Also, if you're uncomfortable working with fuel or electrical systems, call a qualified technician.

Frequently Asked Questions

What does Cummins generator error code 259 mean?
Error code 259 on a Cummins generator indicates a problem with the engine fuel shutoff valve, which controls fuel flow to the engine.
Can I drive with code 259?
No, error 259 is for stationary generators. The generator may not start or may stall, so it's unsafe to rely on it for power until fixed.
How much does it cost to fix error code 259?
DIY replacement of the fuel shutoff solenoid costs $50-$150 for the part. Professional repair may cost $200-$400 including labor.
Will error code 259 clear itself?
No, the code will not clear until the underlying issue is resolved, such as replacing a faulty solenoid or fixing a wiring problem.
How do I test a Cummins fuel shutoff solenoid?
Use a multimeter to check resistance (should be 10-30 ohms) and verify 12V power at the connector when the generator is in Run mode.

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