Safe to driveDrivable, but watch it yourself
J1939 code SPN 3489. Below — how the fault is worded at the factory by DAF and Dongfeng, and what the second half of the code (FMI) means in the standard.
| FMI 3 | EAS dosing module B494 air supply valve short to power supply at dosing module pin B35 (extended period) |
| FMI 4 | EAS dosing module B494 air supply valve short to ground/interruption at dosing module pin B35 or B36 (extended period) |
| FMI 18 | EAS dosing module B494 air supply valve no air supply during dosing (extended period) |
| FMI 3 | Short circuit to ground of the dosing module air solenoid valve |
| FMI 4 | Short circuit to power or open circuit of the air solenoid valve |
| SPN 3489 FMI 33489/3 · 3489.3 | voltage above normal or shorted high |
| SPN 3489 FMI 43489/4 · 3489.4 | voltage below normal or shorted to ground |
| SPN 3489 FMI 183489/18 · 3489.18 | below normal — moderate severity |
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.