P22D4Turbocharger Turbine Inlet Valve Position Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P22D4 is the general circuit fault of the sensor that reports how far the turbine inlet valve is open. Engineering literature explains why this valve, unlike most compressor bypass valves, has feedback: a Ford two-stage patent calls the high-pressure turbine bypass valve emissions-critical and therefore actively controlled with a position sensor, and a GM patent uses the measured opening to run the valve in position control. When the signal is missing or cannot be read at all, the module loses that feedback and typically switches to a fixed fallback position with reduced boost. No manufacturer publicly documents P22D4. The narrower sibling codes P22D6 and P22D7 name a too-low or too-high voltage; P22D4 is used when the fault cannot be assigned that precisely.
- What you may notice
- Check engine light on
- Reduced power, turbo valve held in a fallback position
- Likely causes
- LikelyLoose, heat-damaged or corroded sensor connector
- PossibleDamaged sensor wiring near the turbo
- PossibleFailed position sensor, often integrated in the actuator
- 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: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.