Safe to driveDrivable, but watch it yourself
SPN 520234 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, SITRAK and Volvo, and what the second half of the code (FMI) means.
| FMI 2 | Intake air throttle valve: short circuit / open circuit / overheating |
| FMI 3 | Intake air throttle valve: short circuit / open circuit / overheating |
| FMI 4 | Intake air throttle valve: short circuit / open circuit / overheating |
| FMI 12 | Intake air throttle valve: short circuit / open circuit / overheating |
| FMI 11 | ECU internal monitoring reported a fault, monitoring module (Mon). Scan tool code: P101E. |
| FMI 20 | ECU internal monitoring reported a fault, monitoring module (Mon). Scan tool code: P101F. |
| FMI 21 | ECU internal monitoring reported a fault, monitoring module (Mon). Scan tool code: P1020. |
| FMI 3 | Voltage at the instrument panel input from the LCM is approximately 26 V. Wire between the LCM and the instrument panel lamps shorted to the supply wire. |
| FMI 4 | Voltage at the instrument panel input from the LCM is below 2 V. Open wiring between the LCM and the instrument panel lamps, or wire between the LCM and the instrument panel lamps shorted to ground. |
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.