Safe to driveDrivable, but watch it yourself
SPN 4009 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by International, Renault Trucks and SITRAK, and what the second half of the code (FMI) means.
InternationalRenault TrucksSITRAK
| FMI 5 | Fuel Filter Fuel Heater Relay — Fuel Heater Relay Under Current Or Open Circuit |
| FMI 6 | Fuel Filter Fuel Heater Relay — Fuel Heater Relay Over Current |
| FMI 5 | Proportional solenoid valve, short to ground. Repair: Check the proportional solenoid valve (20-100 ohms), check the wiring between the unit and the component (4), check the control unit. |
| FMI 6 | Proportional solenoid valve, short circuit. Repair: Check the proportional solenoid valve (20-100 ohms), check the wiring between the unit and the component (4), check the control unit. |
| FMI 9 | Proportional solenoid valve, incorrect resistance. Repair: Check the proportional solenoid valve (20-100 ohms), check the wiring between the unit and the component (4), check the control unit. |
| FMI 10 | Proportional solenoid valve, open circuit. Repair: Check the proportional solenoid valve (20-100 ohms), check the wiring between the unit and the component (4), check the control unit. |
| FMI 5 | Open circuit in the fuel heater relay |
| FMI 6 | Fuel heater relay over-temperature |
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.