Do not driveTo the nearest safe stop
SPN 520260 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by SITRAK, and what the second half of the code (FMI) means.
| FMI 0 | Actual CFV floor pressure above target value |
| FMI 1 | Actual CFV floor pressure below target value |
| FMI 3 | CFV voltage too high |
| FMI 4 | CFV voltage too low |
| FMI 12 | CFV internal actuator fault |
| FMI 15 | Actual CFV flow rate above commanded value |
| FMI 17 | Actual CFV flow rate below commanded value |
| FMI 31 | Loss of communication with CFV |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.
This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.