Safe to driveTo the nearest safe stop
J1939 code SPN 1080. Below — how the fault is worded at the factory by Ford Trucks, Isuzu, KAMAZ and SITRAK, and what the second half of the code (FMI) means in the standard.
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 4 | Connector or wiring harness defective (interrupt EU1 or AU1, short circuit between EU1/AU1 and VMGx/vehicle ground, sensor defective), IT-ECU input defective |
| FMI 14 | Connector or wiring harness defective (interrupt VMG3, short circuit between EU1 and AU1/VPSx/AIMx, short circuit between ER1 or ER2 and VPSx/AIMx, sensor defective), IT-ECU input defective |
| FMI 2 | Voltage fault in 5-V power supply 2 (P1632) |
| FMI 3 | Sensor supply voltage, branch 2 |
| FMI 4 | Sensor supply voltage, branch 2 |
| FMI 3 | High voltage on SVE2 |
| FMI 4 | Low voltage on SVE2 |
Safe to drive. Below — how much time you have and what happens if you keep going.
The electrical system is not holding voltage. While the engine runs the alternator carries it; shut it off and you may not restart.
Next the lights go, then modules start dropping out and false codes appear all over the truck. Get to somewhere with help without shutting the engine down.
Check the battery terminals and earth strap — corrosion and loose clamps throw false codes all over the truck. Running voltage should be 27–29 V.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.