Safe to driveDrivable, but watch it yourself
SPN 520757 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by International, and what the second half of the code (FMI) means.
| FMI 5 | Universal Air Solenoid Relay Driver 5 — Universal Air Solenoid Relay Driver 5 Under Current Or Open Circuit |
| FMI 6 | Universal Air Solenoid Relay Driver 5 — Universal Air Solenoid Relay Driver 5 Over Current |
| SPN 520757 FMI 5520757/5 · 520757.5 | current below normal or open circuit |
| SPN 520757 FMI 6520757/6 · 520757.6 | 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.