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The engine has exceeded the maximum safe operating speed limit. The ECM has initiated protective shutdown to prevent catastrophic mechanical failure from excessive rotational forces.
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Common causes are governor failure preventing fuel reduction, sudden load removal, or fuel control stuck in full fuel position. Also check for engine-mounted mechanical governor issues.
Generally no - overspeed is typically caused by control system failure or operating conditions, not manufacturing defect. Damage from overspeed is usually not warranty-covered.
Send us the code or alarm and what the generator is doing, and one of our engineers will help you diagnose it.
Search other controller alarms and engine fault codes, with troubleshooting steps, in Generator Oracle.
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A fault code names a symptom, not a cause. Our engineers have written the diagnostic sequence they use on site for this class of fault — ranked causes, ordered steps with the reading expected at each one, and the point at which to stop and call someone.
10 diagnostic steps · intermediate · technician
8 diagnostic steps · intermediate · technician