Safe to driveDrivable, but watch it yourself
SPN 520256 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by SITRAK and Volvo, and what the second half of the code (FMI) means.
| FMI 2 | Implausible temperature sensor reading at cold start, combination 3. Scan tool code: P1003. Effect: Fan and warm-up control may misbehave. |
| FMI 8 | Implausible temperature sensor reading at cold start, combination 3. Scan tool code: P1003. Effect: Fan and warm-up control may misbehave. |
| FMI 5 | LCM output current to the interior lighting lamps is below 500 mA. Lamps burned out, open wiring between the LCM and the switch, or open wiring between the switch and the ground point. |
| FMI 6 | LCM output current to the interior lighting lamps is above 5.8 A. Short to ground between the LCM and the switch. |
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.