Safe to driveDrivable, but watch it yourself
SPN 275 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Ford Trucks, and what the second half of the code (FMI) means.
Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.
| FMI 3 | PCCM Over Voltage Error |
| FMI 4 | PCCM Under Voltage Error |
| FMI 10 | Internal Electronics Over Temperature |
| SPN 275 FMI 3275/3 · 275.3 | voltage above normal or shorted high |
| SPN 275 FMI 4275/4 · 275.4 | voltage below normal or shorted to ground |
| SPN 275 FMI 10275/10 · 275.10 | 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.