Safe to driveDrivable, but watch it yourself
SPN 4001 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Renault Trucks, and what the second half of the code (FMI) means.
| FMI 5 | Air reservoir solenoid valve, short to ground. Repair: Check the valve (80-140 ohms), check the wiring between the unit and the component (34, 1), check the control unit. |
| FMI 6 | Air reservoir solenoid valve, short circuit. Repair: Check the valve (80-140 ohms), check the wiring between the unit and the component (34, 1), check the control unit. |
| FMI 10 | Air reservoir solenoid valve, open circuit. Repair: Check the valve (80-140 ohms), check the wiring between the unit and the component (34, 1), check the control unit. |
| SPN 4001 FMI 54001/5 · 4001.5 | current below normal or open circuit |
| SPN 4001 FMI 64001/6 · 4001.6 | current above normal or grounded circuit |
| SPN 4001 FMI 104001/10 · 4001.10 | abnormal rate of change |
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.