Safe to driveDrivable, but watch it yourself
J1939 code SPN 3500. Below — how the fault is worded at the factory by DAF, and what the second half of the code (FMI) means in the standard.
| FMI 3 | 5V sensor supply voltage too high at ECU pin A36 (extended period) |
| FMI 4 | 5V sensor supply voltage too low at ECU pin A36 (extended period) |
| SPN 3500 FMI 33500/3 · 3500.3 | voltage above normal or shorted high |
| SPN 3500 FMI 43500/4 · 3500.4 | voltage below normal or 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.