Safe to driveDrivable, but watch it yourself
SPN 520216 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, Meritor (ex-WABCO), Volvo and YaMZ, and what the second half of the code (FMI) means.
KAMAZMAZMeritor (ex-WABCO)VolvoYaMZ
| FMI 3 | CAN: RxAMCON timeout |
| FMI 3 | CAN message RxAMCON error - CAN bus message timeout. Blink code: 4-4-4. Repair: Check the CAN line connection to the other CAN devices. |
| FMI 31 | Reduced ESC Functionality (Trailer ABS Failure) |
| FMI 3 | LCM output voltage is equal to or higher than the LCM supply voltage. Wire between the LCM and the lamps shorted to the supply wire. Check all lamps first. |
| FMI 4 | LCM output voltage is below 2 V. Wires between the LCM and the lamps shorted to ground. |
| 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 1.5 A. Wiring between the LCM and the lamps shorted. Possibly several additional lamps are connected, or higher-wattage lamps are installed. |
| FMI 3 | RxAMCON CAN message fault (CAN bus message timeout). Blink code: 4-4-4. 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.