8 Komatsu diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| E012 / CA2384 | Hydraulics | Swing Function Soft / Heavy Machine Lug | View fix |
| E15 | Hydraulics | Loss of Power. Engine stalls when the operator moves the joysticks. | View fix |
| E15 / CA428 | Hydraulics / Engine | Engine Surging / RPM Fluctuation | View fix |
| E15 / CA428 | Hydraulics / Engine | Engine Surging / RPM Fluctuation | View fix |
| E15 / CA428 | Hydraulics / Engine | Engine Surging / RPM Fluctuation | View fix |
| SPN 520201 FMI 05 | Hydraulics | Boom Up Drift / Slow Raise Cycle | View fix |
| SPN 520285 FMI 14 | Hydraulics | Ripper Stalls / Low Penetration Force | View fix |
| SPN 702 FMI 3 | Electrical / Controls | Attachment Hydraulics Dead | View fix |
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