13 Universal 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 |
|---|---|---|---|
| P0420 | Emissions | Check Engine / High Fuel Use. | Unlock |
| P0A0F | Hybrid / EV | No Start. The vehicle powers on but the engine/motor fails to engage. | Unlock |
| SPN 110 FMI 15 | Cooling | Fan Running 100% / Warning. | Unlock |
| SPN 1569 FMI 31 | Engine | Low Power / Derate. | Unlock |
| SPN 168 FMI 4 | Electrical | Ghost Faults / No Starts. | Unlock |
| SPN 3031 (FMI 3) | Exhaust (SCR) | MIL Lamp / Derate Imminent. | Unlock |
| SPN 3031 (FMI 4) | Exhaust (SCR) | MIL Lamp / Cold Start Issues. | Unlock |
| SPN 3241 / 4360 FMI 16 | Exhaust | Regen Required / High Heat. | Unlock |
| SPN 3360 FMI 10 | Exhaust | DEF Pump Failure. | Unlock |
| SPN 3364 (FMI 2/17) | Exhaust (SCR) | MIL Lamp / 5-MPH Derate. | Unlock |
| SPN 3607 FMI 2 | Engine Control | Engine Won't Stop / Erratic Idle. | Unlock |
| SPN 639 FMI 9 | Network | Dashboard "Blackout" | Unlock |
| SPN 639 FMI 9/14 | Network | Dash is a "Christmas Tree." | Unlock |
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