17 Detroit Diesel diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| DDC 1215 (Legacy) | Network | Shift Hunting / Speedo Dead. | View fix |
| SPN 1077 FMI 14 | Fuel System | No-Start / Sudden Engine Stall | View fix |
| SPN 111 FMI 1 | Cooling | Stop Engine Lamp / Hard Cutout | View fix |
| SPN 1215 (FMI 1) | Fuel System | Engine Stalling / No Start. | View fix |
| SPN 1215 (FMI 10) | Fuel System | Engine Surge / Limp Mode. | View fix |
| SPN 157 FMI 18 | Fuel System | Engine Power Cut / Stumble Under Load | View fix |
| SPN 3226 FMI 20 | Emissions / NOx | Check Engine Light / Inducement Risk | View fix |
| SPN 3480 FMI 2 | Fuel System / Regen | Parked Regen Fails / Low Doser Press | View fix |
| SPN 3482 FMI 5 | Emissions / Fuel | Parked Regen Fails to Initiate | View fix |
| SPN 3719 FMI 0 | Emissions / DPF | Active DPF Lamp / Torque Derate | View fix |
| SPN 4334 FMI 4 | Emissions / DEF | Active 5 MPH Derate / DEF Lamp Solid | View fix |
| SPN 4364 FMI 18 | Emissions | DEF Light Active / Heavy Derate | View fix |
| SPN 520268 FMI 18 | Fuel System | Engine Derate / Extended Crank | View fix |
| SPN 520371 FMI 16 | Emissions | MIL On / Elevated DEF Consumption | View fix |
| SPN 520372 FMI 16 | Emissions | Progressive 5 MPH Inducement Derate | View fix |
| SPN 5246 FMI 0 | Emissions | Immediate 5 MPH Lockout Derate | View fix |
| SPN 5397 FMI 31 | Emissions / DPF | Active DPF Light / High Fuel Burn | View fix |
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