Kohler Generator Error Code 08: How to Fix It
Medium 30-60 minutes High Severity
Verified June 2026
- Error Code
- 08
- Brand
- Kohler
- Product Type
- generator
- Severity
- High
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Multimeter with AC/DC voltage and diode test
- Screwdrivers (flathead and Phillips)
- Wrench set
- Insulated gloves
- Flashlight
How to Fix Error Code 08
-
Safety First: Disconnect Load and Turn Off Generator
Do not attempt any repairs while the generator is running. Risk of electric shock or injury. -
Check the Load
-
Test Output Voltage with a Multimeter
Be cautious of live terminals. Wear insulated gloves if available. -
Inspect the Voltage Regulator
Disconnect the battery and generator control wiring before touching the regulator. -
Check the Rectifier Bridge
The rectifier may be hot; let it cool down first. -
Inspect Wiring and Connections
Ensure the generator is off before touching wires. -
Test the Generator Head (Optional)
This test requires knowledge of electrical systems. If unsure, call a technician.
Parts You May Need
Voltage regulator (AVR)
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Rectifier bridge
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Voltage regulator (AVR)
Check Price on Amazon
Rectifier bridge
Check Price on Amazon
Voltage regulator (AVR)
Check Price on Amazon
Rectifier bridge
Check Price on Amazon
Voltage regulator (AVR)
Check Price on Amazon
Rectifier bridge
Check Price on Amazon
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When to Call a Professional
If you have tested the voltage regulator, rectifier, and wiring and the problem persists, or if you are not comfortable working with high voltage, call a certified Kohler generator technician. Generator head repairs require specialized knowledge.Frequently Asked Questions
What does error code 08 mean on a Kohler generator?
Error code 08 means the generator is producing voltage below the acceptable threshold, known as under voltage.
Can I reset error code 08 on my Kohler generator?
Yes, after fixing the underlying issue, turn off the generator, wait a few minutes, then restart it. The error code should clear.
Is it safe to run my generator with error code 08?
No, running with under voltage can damage sensitive electronics connected to the generator. Stop use until the issue is resolved.
What part usually fails causing error code 08 on a Kohler generator?
The most common cause is a faulty voltage regulator. The rectifier bridge is also a common suspect.
How do I test the voltage regulator on my Kohler generator?
Use a multimeter to check for correct output voltage. If no voltage or very low voltage is present despite proper engine speed, the regulator likely needs replacement.