Diagnostics

Komatsu Excavator Fault Codes: Meanings, Causes & Fixes

In-depth, plain-English guides to Komatsu Excavator fault codes and error codes. Each guide covers what the code means, what triggers it, the most common causes, and the first things to check before you call the dealer.

CA428Water in Fuel Sensor High Error
CA555Crankcase Pressure High Error 1
D19JKZPersonal Code Relay Abnormality
DA2RMCCAN Discon (Pump Con Detected)

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Safety-critical: confirm before use

Torque, lifting, and load-chart values are safety-critical. Never operate from these figures alone. Confirm against the official manual and a qualified technician.