Safe to driveDrivable, but watch it yourself
J1939 code SPN 558. Below — how the fault is worded at the factory by DAF, Mercedes-Benz, Renault Trucks and SITRAK, and what the second half of the code (FMI) means in the standard.
DAFMercedes-BenzRenault TrucksSITRAK
| FMI 2 | Accelerator pedal idle switch signal fault |
| FMI 4 | Accelerator pedal voltage too low at ECU pin B1/B11 |
| FMI 13 | Accelerator pedal not calibrated, out of tolerance |
| FMI 2 | Idle Validation Switch Inputs Reversed |
| FMI 3 | Idle Validation Switch 1 Circuit shorted to Ubat |
| FMI 4 | Idle Validation Switch 1 Circuit shorted to GND |
| FMI 6 | Idle Validation Switch 2 Circuit shorted to Ubat |
| FMI 7 | “Accelerator pedal released” contact stuck closed or open. Repair: Check the continuity of the link on pins 3 and 4 of the pedal unit with the pedal released, press the pedal and check that the state changes; if it does, check the wiring (SL2/1). |
| FMI 2 | Accelerator pedal and idle switch signals do not match. Scan tool code: P2135. |
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.