C0520
Brake Pedal Force Sensor Circuit
On systems with brake force sensing the dedicated sensor reports an implausible signal.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failedCommon
- Wiring openPossible
Parts involved
- Brake Pedal Force Sensor
- Sensor Wiring
C0520 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.