Safe to driveTo the nearest safe stop
J1939 code SPN 633. Below — how the fault is worded at the factory by DAF, Dongfeng and Isuzu, and what the second half of the code (FMI) means in the standard.
| FMI 31 | ECU D984 internal fault 4 (fuel injection pump valve B334) |
| FMI 31 | Implausible solenoid valve resistance value |
| FMI 7 | Pressure limiter open (P1095) |
| SPN 633 FMI 7633/7 · 633.7 | mechanical system not responding |
| SPN 633 FMI 31633/31 · 633.31 | condition exists (see manufacturer description) |
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.
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.