Kohler Generator Error Code 06: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
Error Code
06
Brand
Kohler
Product Type
generator
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Kohler generator error code 06 indicates the engine is running below its designed speed (under speed condition). This can be caused by a faulty governor, clogged fuel system, or a malfunctioning control module. Follow these steps to diagnose and fix the issue.
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Tools You'll Need

How to Fix Error Code 06

  1. Turn Off the Generator and Disconnect Load

    Always turn off the generator and let it cool before performing any maintenance. Never operate a generator inside your home.
  2. Check Fuel Supply and Quality

  3. Inspect Air Filter

  4. Check Governor and Throttle Linkage

    Be careful not to over-adjust the governor; improper adjustment can cause engine damage.
  5. Test the Control Module

    Disconnect the battery before testing electrical components to avoid shock or short circuits.
  6. Check for Carbon Buildup or Mechanical Binding

    Ensure the ignition is off and the spark plug wires are disconnected before turning the flywheel.

Parts You May Need

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When to Call a Professional

If you have checked fuel, air filter, and governor but the error persists, or if you suspect a faulty control module or internal engine issue, contact a certified Kohler technician. Electrical repairs require expertise.

Frequently Asked Questions

Can I run my Kohler generator with error code 06?
No, running the generator under speed can damage sensitive electronics and the engine. Stop using it immediately and diagnose the issue.
Will a low oil level cause error code 06?
Low oil level typically triggers a different error code (like low oil shutdown). However, low oil pressure can affect engine speed, so check oil level as part of troubleshooting.
How do I adjust the governor on a Kohler generator?
Locate the governor arm and spring. Loosen the clamp bolt, move the arm to the full throttle position, then tighten. Refer to your model's manual, as improper adjustment can cause damage.
Is error code 06 common on Kohler generators?
Yes, it's a relatively common issue, often caused by fuel problems or a dirty air filter. Regular maintenance can prevent it.
What does 'under speed' mean on a generator?
Under speed means the engine is running slower than the designed frequency (usually 60 Hz in North America). This leads to unstable voltage and can damage connected devices.