P22C5Turbocharger Compressor Outlet Valve Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P22C5 flags an open or broken drive circuit for the turbocharger compressor outlet valve. That valve sits in the charge-air path downstream of a compressor and decides whether this compressor feeds the engine, for example in register or two-stage charging or next to an electric auxiliary compressor. While the output is switched off, the engine control module compares the voltage on its driver with the level expected for an intact load; a reading typical of a cut wire or an unplugged connector sets the code. California OBD rules treat such boost actuators as monitored output components. No manufacturer publicly documents P22C5 itself; Mercedes-Benz uses the related stuck codes P22C8 and P22C9 on the M256 engine. With the valve unpowered, the module usually limits boost and power.
- What you may notice
- Check engine light on
- Reduced power because boost is limited
- Weak or delayed pull at the speed where the second boost path should join
- Likely causes
- LikelyValve connector loose, unplugged or corroded
- PossibleBroken wire in the valve harness, often near hot turbo parts
- PossibleOpen actuator coil inside the compressor outlet valve
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.