Safe to driveDrivable, but watch it yourself
SPN 520221 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ, SITRAK, Volvo and YaMZ, and what the second half of the code (FMI) means.
| FMI 2 | Gear shift unit: implausible request |
| FMI 2 | Implausible operation of the gear-shift control unit - Implausible TSC command. Blink code: 2-2-7. Repair: Check the gear shift control unit and its wiring. |
| FMI 11 | ECU internal monitoring reported a fault, computer monitoring level (MoC). Scan tool code: P060C. Effect: OBD limits torque immediately. |
| FMI 3 | LCM detects a short circuit at output (LC2 15) to the indicator lamp. Wiring between the LCM and the light switch shorted to the supply wire. |
| FMI 4 | LCM output voltage to the front fog lamp indicator is below 1.2 V. Wiring between the LCM and the light switch shorted to ground. |
| FMI 2 | Physical implausibility in transmission shift control unit operation (Implausible TSC command). Blink code: 2-2-7. Repair: Check the gear shift control unit and its wiring. |
Safe to drive. Below — how much time you have and what happens if you keep going.
This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.
You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.