C055E
Brake Hydraulic Circuit A Leak
Brake Hydraulic Circuit A Leak: a leak has been detected in this brake-hydraulic circuit, which reduces braking pressure. Safety-critical.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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.
- Brake fluid leak in circuit ACommon
Parts involved
- Brake Circuit A
C055E 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.