Safe to driveTo the nearest safe stop
J1939 code SPN 38. Below — how the fault is worded at the factory by SITRAK and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.
| FMI 3 | Fuel level sensor voltage above the upper limit. Scan tool code: P0460. Effect: Power limited, the engine runs unevenly. |
| FMI 4 | Fuel level sensor voltage below the lower limit. Scan tool code: P0460. Effect: Power limited, the engine runs unevenly. |
| FMI 19 | Fuel level signal error on the CAN bus. Effect: Loss of communication with the modules, some functions are disabled. |
ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.
| FMI 10 | Fault on valve Y6 output circuit (engagement valve). |
Safe to drive. Below — how much time you have and what happens if you keep going.
Fuel is not arriving in the right amount or at the right pressure. It shows up first on climbs and under load.
You will most likely stall out on the road, and may not restart on the shoulder. A clogged filter or water in the tank you can nurse to a shop; a failing injection pump you cannot.
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.
Check the fuel filter and water trap, drain the water. In cold weather, suspect fuel waxing.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.