C0302Outlet Valve Front Left Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0302 has no public footprint: the publicly available J2012 tables, GM's PIP5094, the AA1Car chart and the NHTSA bulletin index all lack it. This text therefore covers only the front left outlet valve named in the title. Unlike the inlet valve it stays closed at rest and opens only when the brake module wants to drop pressure at a locking wheel; the released fluid goes into an accumulator from which the return pump feeds it back. TRW calls this part the dump valve. If it opens too slowly, the front left wheel can lock; if it leaks, pressure escapes and the pedal sinks or the car pulls right. Bosch places these valves, the return pump and the control unit together in one hydraulic unit, so a valve fault usually means repairing that unit.
- What you may notice
- ABS warning lamp on, ABS switched off
- Front left wheel locks or pedal sinks slowly
- Likely causes
- PossibleOutlet valve seat leaking because of dirt or wear
- PossibleValve coil or its driver in the brake module faulty
- RareOld or wrong brake fluid slowing the valve
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.