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Engine Protection System - Derate Active
The Engine Protection System (EPS) has activated a power derate to protect the engine from damage. This fault indicates one or more engine parameters have exceeded safe limits, causing the ECM to reduce engine power output. Common triggers include high coolant temp, high intake temp, low oil pressure, or aftertreatment issues.
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Engine derate means the ECM has reduced power output to protect the engine from damage. This is triggered by another fault condition and is a protective measure, not the root cause.
You must first identify and fix the underlying fault that triggered the derate. Use a diagnostic tool to read all fault codes, repair the root cause, then clear codes. The derate will automatically lift once conditions return to normal.
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