20 Universal HD 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 100 FMI 01 | Lubrication | Immediate Engine Stop Warning / Siren | Unlock |
| SPN 102 FMI 18 | Air Induction | Black Exhaust Smoke / Sluggish Acceleration | Unlock |
| SPN 105 FMI 03 | Air Intake | White Smoke Cold / Harsh Cold Engine Clatter | Unlock |
| SPN 108 FMI 03 | Sensors / Ambient | Sluggish High Altitude Power / Rich Burn | Unlock |
| SPN 110 FMI 00 | Cooling | Red Stop Lamp / Engine Fan Locked at 100% | Unlock |
| SPN 111 FMI 01 | Cooling / Engine | Red Stop Lamp / 30-Second Timed Shutdown | Unlock |
| SPN 157 FMI 18 | Fuel / HPCR | Engine Lugs Down / Power Cuts on Pull | Unlock |
| SPN 1761 FMI 01 | Aftertreatment / SCR | Flashing DEF Lamp / Impending Speed Derate | Unlock |
| SPN 190 FMI 00 | Engine / Overspeed | Check Engine Solid / Historical Event Log | Unlock |
| SPN 3031 FMI 04 | Aftertreatment / SCR | DEF Warning Light / SCR Limp Mode | Unlock |
| SPN 3216 FMI 20 | Sensors / Exhaust | Check Engine Solid / High DEF Consumption | Unlock |
| SPN 3226 FMI 04 | Sensors / Exhaust | Yellow Emissions Lamp / SCR Derate Imminent | Unlock |
| SPN 3251 FMI 00 | Aftertreatment / DPF | Stop Engine Flashing / Severe 40% Derate | Unlock |
| SPN 3556 FMI 05 | Aftertreatment / DPF | Regen Aborted / DPF Overload Light | Unlock |
| SPN 4364 FMI 18 | Aftertreatment / SCR | DEF Lamp Solid / 25% Engine Torque Derate | Unlock |
| SPN 520200 FMI 05 | Braking / Auxiliary | Engine Brake Inoperative / Long Stopping Drag | Unlock |
| SPN 5246 FMI 00 | Aftertreatment / SCR | Speed Capped at 5 MPH (20 km/h) / Severe Derate | Unlock |
| SPN 639 FMI 09 | Communication | Cluster Freezes / Transmission Drops Shifting | Unlock |
| SPN 641 FMI 07 | Turbocharger | Low Boost / Engine Exhaust Whistle | Unlock |
| SPN 94 FMI 18 | Fuel Delivery | Engine Hesitation / Hard Acceleration Cut | Unlock |
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