Safe to driveDrivable, but watch it yourself
J1939 code SPN 723. Below — how the fault is worded at the factory by DAF, Dongfeng, Isuzu and SITRAK, and what the second half of the code (FMI) means in the standard.
| FMI 2 | Camshaft speed/position F558 signal missing/implausible |
| FMI 7 | Camshaft speed F558 misalignment relative to crankshaft sensor F552 |
| FMI 2 | No signal from the camshaft speed sensor |
| FMI 7 | Asynchronous signals from the two engine speed sensors |
| FMI 2 | Crank sensor fault (no signal) (P0335) |
| FMI 2 | Camshaft position sensor signal noise |
| FMI 4 | Loss of camshaft position sensor signal |
| SPN 723 FMI 2723/2 · 723.2 | data erratic or intermittent |
| SPN 723 FMI 4723/4 · 723.4 | voltage below normal or shorted to ground |
| SPN 723 FMI 7723/7 · 723.7 | mechanical system not responding |
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.