Komatsu · E256
Illegal non-volatile memory data
What this code means
The stored (non-volatile memory) data is incorrect/illegal.
Applies to: PC200-7 excavator (service code).
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (E256), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: Komatsu PC200/220(LC)-7 Shop Manual – Testing and Adjusting, service codes table. Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.