34 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.
Find a Komatsu code by searching below, or browse the table. Codes on file by system:
| Code | System | Symptom | Full fix |
|---|---|---|---|
| 168-4 | Electrical | Controller "Brown Out" | View fix |
| 989L00 | Security | No start; Controller Lock Caution. | View fix |
| A001 / Event 16 | Electric Propulsion | No Propulsion / DC Bus Warning Lamp | View fix |
| A105 / Code 105 | Electric Propulsion | Propulsion Cut / Inverter Fault Code | View fix |
| AA10NX | Intake | Engine Derate (E11); Air filter light. | View fix |
| CA2249 / P228C | Fuel System | Derate / Engine Stumble | View fix |
| CA559 | Fuel System | Derate / Engine Stalls | View fix |
| CA559 | Fuel System | Derate / Engine Stalls under Load | View fix |
| CA559 / SPN 157 FMI 18 | Fuel System | Power Cut under Load / Stalling | View fix |
| Code 2301 / A2301 | Safety / Interlock | Hoist Body Inoperative / Dump Locked | View fix |
| Code 52-11 | Electric Propulsion | Propulsion Cutout / Blower Warning | View fix |
| DHPAMA | Hydraulic Monitoring | Hydraulic Drift / Error Code Active | View fix |
| DX19KZ | Hydraulic | Travel Motor Shift Malfunction / Active E03 Alarm | View fix |
| DXE5KA | Hydraulic System | Slow Attachment Movement / No Pump Merge | View fix |
| E012 / CA2384 | Hydraulics | Swing Function Soft / Heavy Machine Lug | View fix |
| E02 | — | Pump Contol Error. | View fix |
| E042 / SPN 100 FMI 1 | Lubrication | Automatic Level 3 Engine Shutdown | View fix |
| E11 | — | Engine Derate. Significant loss of power; "Engine Protection" active. | 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 |
| E202 | Hydraulic | LS Select Solenoid Valve: Short Circuit | View fix |
| Event 200 / F-02 | Electric Propulsion | Dynamic Retarding Dead / Overheat Alert | View fix |
| Event 311 / E311 | Electric Propulsion | Propulsion Cut / Retard Grid Alarm | View fix |
| P0562 | Electrical | Controller Comm. Lost | View fix |
| SPN 3509 FMI 3 | Electrical | All Digging Telemetry Lost on Dash | View fix |
| SPN 3509 FMI 4 | Electrical | All Digging Telemetry Lost on Monitor | 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 520830 FMI 02 | Drive / Motor | Motor Stutters / Violent Shaft Vibration | View fix |
| SPN 520880 FMI 01 | Battery / Thermal | Low Operating Power / Fast Charge Denied | View fix |
| SPN 520950 FMI 00 | Thermal / Motor | Reduced Digging Force / Motor Temp Warning | View fix |
| SPN 702 FMI 3 | Electrical / Controls | Attachment Hydraulics Dead | View fix |
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