6 John Deere 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 |
|---|---|---|---|
| F402 | RCU | Machine won't move; One track dead; Swing function fails. | View fix |
| F450 | RCU | Hydraulics are sluggish; Boom or bucket "drifts"; Auto-idle not working. | View fix |
| SPN 1883 FMI 04 | PTO / Implement | Rear PTO Cuts Out Instantly Under Load | View fix |
| SPN 2659 FMI 18 | Emissions | Check Engine Light / Light Derate | View fix |
| SPN 3510 - FMI 4 | Electrical | Multiple Random Sensor Faults / Low Voltage | View fix |
| SPN 641 FMI 5 | Turbo | Low Boost / Black Smoke | View fix |
Same codes keep coming back?
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