Safe to driveDrivable, but watch it yourself
SPN 520527 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Meritor (ex-WABCO) and SITRAK, and what the second half of the code (FMI) means.
| FMI 3 | Failure detection 'ShortUb' at SolenoidValve (Trailer ABV) |
| FMI 4 | Failure detection 'ShortGnd' at SolenoidValve (Trailer ABV) |
| FMI 5 | Failure detection 'Interruption' at SolenoidValve (Trailer ABV) |
| FMI 13 | Failure detection 'OverEquipped' at SolenoidValve (Trailer ABV) |
| FMI 16 | DEF tank level sensor physical value above the upper limit. Scan tool code: P203A. Effect: Torque limited, MIL on, power may drop to 60%. |
| FMI 18 | DEF tank level sensor physical value below the lower limit. Scan tool code: P203A. Effect: Torque limited, MIL on, power may drop to 60%. |
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.