Safe to driveDrivable, but watch it yourself
SPN 520217 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, Volvo and YaMZ, and what the second half of the code (FMI) means.
| FMI 3 | CAN: TF timeout |
| FMI 3 | CAN message TF error - CAN bus message timeout. Blink code: 4-5-2. Repair: Check the CAN line connection to the other CAN devices. |
| FMI 5 | LCM output current to the lamps is below 0.1 A. Open wiring between the LCM and the lamps, or lamp failure. |
| FMI 6 | LCM output current to the lamps is above 10 A. Wiring between the LCM and the lamps shorted. Possibly several additional lamps are connected, or higher-wattage lamps are installed. |
| FMI 3 | TF CAN message fault (CAN bus message timeout). Blink code: 4-5-2. Repair: Check the CAN line connection to the other CAN devices. |
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.