13 Freightliner diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| SPN 108 FMI 13 | Sensors / Air | Engine Sluggish / Black Exhaust | Unlock |
| SPN 168 FMI 1 | Electrical | Multiple Random Faults / Hard Shift | Unlock |
| SPN 3031 FMI 3 | Emissions / DEF | DEF Warning Light / Frozen Line Alert | Unlock |
| SPN 3216 FMI 20 | Emissions / NOx | Check Engine Light / Inducement | Unlock |
| SPN 3238 FMI 2 | Emissions / NOx | Check Engine Light / Inducement | Unlock |
| SPN 3556 FMI 1 | Emissions / DPF | Parked Regen Incomplete / Smoke | Unlock |
| SPN 3610 FMI 2 | Emissions / DPF | DPF Warning / Regenerations Stopped | Unlock |
| SPN 4334 FMI 3 | Emissions / DEF | DEF System Fault / Power Derate | Unlock |
| SPN 4360 FMI 15 | Emissions / SCR | SCR Efficiency Fault / MIL On | Unlock |
| SPN 520328 FMI 7 | Emissions / DEF | DEF Pump Whine / System Fault | Unlock |
| SPN 521049 FMI 31 | Emissions | Speed Restricted to 5 MPH (Final Derate) | Unlock |
| SPN 609 FMI 12 | Computer / CAN | Dead Throttle / No-Start / No Crank | Unlock |
| SPN 625 FMI 9 | Communication | Engine Runs at Fixed Idle / Dash Alert | Unlock |
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