Code 41
Onan
Loss of Engine Speed Signal
Generator shuts down; Code 41 displayed indicating loss of engine speed signal
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed magnetic pickup (speed sensor), Loose or damaged sensor wiring, Excessive sensor gap to flywheel, Faulty controller input circuit
How to Fix / Troubleshooting
Safety first: Disable auto-start and open the main breaker. Allow moving parts to stop before working near the flywheel.
- Locate speed sensor: Find the magnetic pickup near the flywheel or ring gear. Inspect for physical damage or oil contamination.
- Clean and adjust sensor: Clean metal debris from the sensor tip. Verify and adjust the air gap to the specified distance using a feeler gauge.
- Check wiring: Inspect the harness from the sensor to the controller for chafing or loose connectors. Repair and reseat as needed.
- Sensor replacement: If Code 41 persists, replace the speed sensor with an Onan-approved part. If a new sensor does not resolve the issue, the controller input may be defective.
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Repair Difficulty
Medium
3/5
Required Part
Speed Sensor (Magnetic Pickup)
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