Kohler Generator Error Code 13: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
13
Brand
Kohler
Product Type
generator
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code 13 on a Kohler generator means the field current is too high. This usually points to a problem with the voltage regulator or the rotor/stator windings. We'll walk you through diagnosing the issue step by step.
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Tools You'll Need

How to Fix Error Code 13

  1. Safety First: Disconnect Power

    Electric shock hazard. Always disconnect power before servicing.

  2. Inspect Wiring and Connections

  3. Test the Rotor Resistance

    Disconnect the generator from all power sources before testing.

  4. Test the Stator Windings

  5. Test the AVR (Automatic Voltage Regulator)

    Capacitors in the AVR may hold a charge. Discharge before testing.

  6. Replace Faulty Components

    Use only genuine Kohler or approved replacement parts.

Parts You May Need

Automatic Voltage Regulator (AVR)
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Rotor Assembly
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Stator Assembly
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Automatic Voltage Regulator (AVR)
Check Price on Amazon
Rotor Assembly
Check Price on Amazon
Stator Assembly
Check Price on Amazon
Automatic Voltage Regulator (AVR)
Check Price on Amazon
Rotor Assembly
Check Price on Amazon
Stator Assembly
Check Price on Amazon
Automatic Voltage Regulator (AVR)
Check Price on Amazon
Rotor Assembly
Check Price on Amazon
Stator Assembly
Check Price on Amazon
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When to Call a Professional

If you are not comfortable working with high voltage or the generator does not generate power after replacing the AVR or rotor, call a certified Kohler technician. Internal engine or generator head damage may require professional service.

Frequently Asked Questions

What causes Kohler generator error code 13?
Error code 13 indicates high field current, typically due to a faulty AVR, shorted rotor windings, or stator issues.
Can a bad battery cause error code 13?
No, the battery is not directly related. The error is in the generator's excitation system.
How do I reset error code 13 on my Kohler generator?
Turn off the generator and disconnect power for 5 minutes. Reconnect and restart. If the error returns, there is an underlying issue.
Can I replace the AVR myself?
Yes, if you have basic electrical knowledge and tools. Ensure the generator is completely powered off. Follow the manufacturer's instructions.
What tools do I need to diagnose error code 13?
A digital multimeter is essential. Screwdrivers and wrenches are needed to access components.

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