Safe to driveDrivable, but watch it yourself
SPN 520252 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by SITRAK and Volvo, and what the second half of the code (FMI) means.
| FMI 2 | Accelerator pedal and idle switch signals do not match. Scan tool code: P2135. Effect: Pedal failure: idle raised to 1000 rpm, torque limited to 1800 Nm, cruise control off. |
| FMI 5 | LCM output current to the rear fog light switch is below 0.1 A. Open wiring between the LCM and the light switch, or open wiring between the light switch and the ground point. |
| FMI 6 | LCM output current to the rear fog light switch is above 3.8 A. Wiring between the LCM and the light switch shorted to ground. |
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.