C0578
Park Brake Switch Stuck Open
The EPB module has detected that the park brake operator switch remains in the open (released) state when an apply request is expected. Operation of the EPB by the driver is restricted.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
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.
- EPB switch contacts stuck openCommon
- Wiring break in switch circuitPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Epb Switch
- Epb Module
- Switch Wiring
C0578 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.