Safe to driveEnough to reach the yard
J1939 code SPN 3050. Below — how the fault is worded at the factory by DAF, MAZ, SITRAK and YaMZ, and what the second half of the code (FMI) means in the standard.
| FMI 0 | Catalyst temperature F765/F766 temperature too high (extended period) |
| FMI 31 | Catalyst temperature F765/F766 not detected (extended period) |
| FMI 0 | DPF blocked - Voltage above allowed. Blink code: 6-1-5. Repair: Check the aftertreatment filter. |
| FMI 1 | DPF removed - Voltage above allowed. Blink code: 6-1-7. Repair: Regenerate the aftertreatment filter. |
| FMI 3 | DPF differential pressure sensor error - Voltage above allowed. Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
| FMI 4 | DPF differential pressure sensor error - Voltage below allowed. Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
| FMI 12 | DPF differential pressure sensor error - CAN bus signal implausible. Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
| FMI 11 | Three-way catalyst oxygen storage capacity monitor |
| FMI 0 | Particulate filter blocked (Voltage above allowable limit). Blink code: 6-1-5. Repair: Check the aftertreatment filter. |
| FMI 1 | Particulate filter removed (Voltage above allowable limit). Blink code: 6-1-7. Repair: Regenerate the aftertreatment filter. |
| FMI 3 | Particulate filter differential pressure sensor fault (Voltage above allowable limit). Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
| FMI 4 | Particulate filter differential pressure sensor fault (Voltage below allowable limit). Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
| FMI 12 | Particulate filter differential pressure sensor fault (CAN bus signal implausible). Blink code: 6-1-6. Repair: Check the aftertreatment filter differential pressure sensor and its wiring. |
Safe to drive. Below — how much time you have and what happens if you keep going.
Urea dosing is interrupted and the ECU is counting. First the lamp, then a torque cut, then a forced crawl speed — the stages come in by engine hours, not all at once.
The truck will not die mid-highway, but the window shrinks with every running hour. Plan the repair now, not when the power is gone: an emulator or "deleting AdBlue" does not remove the problem, the codes keep stacking.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Fill the AdBlue tank. If it’s already full, the problem is dosing or reductant quality — you need a scanner.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.