Komatsu Fault Code

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CA2249 / P228C

Derate / Engine Stumble

System

Fuel System

Symptom

Derate / Engine Stumble

Diagnosis & fix steps

LOGIC: Common Rail Fuel Pressure Too Low (Regulator Limit Reached). ACTION: Check fuel lift pump delivery pressure. Inspect the high-pressure fuel rail relief valve for excessive return-line leakage (bypassing fuel back to tank).

Red Seal field insights

Physics: The high-pressure pump is maxing out its volume control command, but the fuel rail pressure transducer still reports a pressure drop below threshold.

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