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Engine Overspeed
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.
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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