C0173Right Rear ABS Outlet Solenoid Circuit Malfunction
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- No accessible J2012 list, maker index or NHTSA bulletin contains C0173, so the code cannot be tied to any vehicle; Saab, for instance, reports a fault in either valve of the right rear wheel as C2485. By its title it covers the release valve of the right rear brake. In the Saab hydraulic unit this valve is closed at rest and opens, together with the return pump, only when that wheel nears lock-up, letting fluid out of the caliper into a small accumulator. Saab energises every valve for 20 ms in a self-test at each key-on and switches ABS, traction and stability control off when one fails. An outlet coil that cannot open leaves the rear wheel prone to locking during ABS braking; a leaking one lets the caliper lose pressure.
- What you may notice
- ABS and brake warning lamps on, ABS/TCS/ESC switched off
- Right rear wheel may lock under hard braking
- Likely causes
- LikelyOpen or shorted coil of the right rear outlet valve
- PossibleCorroded or loose contact between valve block and control module
- RareFaulty valve driver stage inside the control module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.