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 |
|---|---|---|---|
| E1447 / SPN 3610 | Aftertreatment | Active Derate / DPF Light | View fix |
| SPN 3719 FMI 16 | Aftertreatment | Soot Level High / Regen Forced. | View fix |
| SPN 4364 FMI 18 | Aftertreatment | Derate Warning / Selective Catalytic Reduction | View fix |
| SPN 4364 FMI 18 | Aftertreatment | Derate Warning / Selective Catalytic Reduction | View fix |
| SPN 5246 FMI 15 | Aftertreatment | Derate / 60-min Timer | View fix |
| SPN 5246 FMI 16 | Aftertreatment | Derate (5 MPH Limit) | View fix |
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