Safe to driveDrivable, but watch it yourself
J1939 code SPN 564. Below — how the fault is worded at the factory by Bendix ABS/ESP and International, and what the second half of the code (FMI) means in the standard.
| FMI 3 | HSA Solenoid Shorted to Voltage (high) |
| FMI 5 | HSA Solenoid Shorted to Ground (Low) or Open circuit |
| FMI 5 | Differential Lock State - Central — Transfer Case Lock Under Current Or Open Circuit |
| FMI 6 | Differential Lock State - Central — Transfer Case Lock Relay Over Current |
| SPN 564 FMI 3564/3 · 564.3 | voltage above normal or shorted high |
| SPN 564 FMI 5564/5 · 564.5 | current below normal or open circuit |
| SPN 564 FMI 6564/6 · 564.6 | current above normal or grounded circuit |
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.