RPM Sense Loss
Generac Standby Generator
Severity: CriticalWhat Does This Error Mean?
RPM Sense Loss means the Generac control board lost the engine speed signal. Check the magnetic pickup sensor and its wiring before suspecting the control board.
How to Fix It
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Check the magnetic pickup sensor
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Check the sensor gap
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Inspect sensor wiring
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Clean the connector
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Test the sensor output
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Replace the sensor if faulty
Frequently Asked Questions
What is RPM Sense Loss on a Generac generator?
It means the engine control module stopped receiving the speed signal from the magnetic pickup sensor. Without speed feedback, the board cannot control ignition or fuel, so it shuts down.
Can a bad control board cause RPM Sense Loss?
Yes, but it is much less common than a faulty sensor or wiring problem. Always check the sensor and wiring first before replacing the more expensive control board.
Does RPM Sense Loss always stop the engine?
Yes — without a valid speed signal the Generac control board performs a safety shutdown. The alarm must be investigated before the generator will run again.