What does code C0309 mean?

Q: What does code C0309 mean?

Outlet Valve Rear Right Performance. C0309 indicates that the anti-lock brake system (ABS) control module has detected a performance fault with the rear right outlet valve, which is the solenoid valve that releases hydraulic pressure from that wheel's brake circuit during ABS operation. The module typically monitors valve response through pressure changes or electrical feedback and sets the code when the valve does not release pressure as commanded.

DTC codes / C03xx · Brakes, steering and suspension / C0309

C0309Outlet Valve Rear Right Performance

C0309 indicates that the anti-lock brake system (ABS) control module has detected a performance fault with the rear right outlet valve, which is the solenoid valve that releases hydraulic pressure from that wheel's brake circuit during ABS operation. The module typically monitors valve response through pressure changes or electrical feedback and sets the code when the valve does not release pressure as commanded.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaBrakes, steering and suspension

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.