P22CBTurbocharger Compressor Outlet Switching Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P22CB is set when the control line of the compressor outlet switching valve shows too little voltage for the present command, most often because the wire or the solenoid has a short to ground. On a low-side driven solenoid such a short can hold the valve energized all the time, so the outlet flap it supplies with vacuum or pressure stays in its switched position whatever the rpm and load. The module spots the fault through its driver diagnostics without any special driving. The solenoid is a small part in the actuating line of the outlet flap and is usually inexpensive; the wiring near the hot turbo area deserves a careful look. No manufacturer publicly documents P22CB. If P22C6 is present as well, look for a shared harness section or connector.
- What you may notice
- Check engine light on
- Boost path stuck in one mode, uneven power across the rev range
- Reduced power at low or high engine speed
- Likely causes
- LikelyControl wire chafed and shorted to ground
- PossibleInternal short in the switching solenoid
- RareWater or corrosion in the solenoid connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.