Komatsu · E04
Joystick neutral system fault (HYPER)
What this code means
Fault in the joystick mid-position (neutral) system in the HYPER system; displayed together with CALL (user code).
Applies to: PC200-6/PC200-7 excavator (HYPER, user code).
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If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (E04), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: SINOCMP – Komatsu PC200-7 Error Code on the Monitor. Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.