C0304Outlet Valve Front Right Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- No public source confirms C0304; searches of the J2012 tables at hand, of GM's keyword bulletin PIP5094, of AA1Car and of the NHTSA bulletin index came up empty. The title concerns the front right outlet valve, the part that bleeds pressure off that caliper when the wheel starts to lock. In the TRW brake system of Saab's 2011 9-5, the EBC450, the module first holds pressure by closing the inlet valve and only then opens this dump valve, sending fluid into the accumulator, from where the pump returns it. A valve that will not open lets the front right wheel lock; a valve that does not reseal drains pressure, gives a long pedal and can make the car pull left. Saab's ESP version uses the same valves for stability braking, so the fault disables ABS and ESP alike.
- What you may notice
- ABS and stability control warning lamps on
- Long brake pedal or front right wheel locking
- Likely causes
- PossibleOutlet valve not resealing because of dirt in the seat
- PossibleValve coil or brake module output stage defective
- RareAccumulator or return pump unable to take the released fluid
- 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.