3 Paccar 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 168 FMI 4 | — | Electronics Glitch. | Unlock |
| SPN 3719 FMI 16 | Aftertreatment | Active DPF Warning Light | Unlock |
| SPN 4364 - FMI 17 | Aftertreatment | Low SCR Conversion Efficiency / Exhaust Smell | Unlock |
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