P22D1Turbocharger Turbine Inlet Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P22D1 tells you the drive circuit of the turbine inlet valve reads too high, which usually means a short to battery voltage or an actuator that draws overcurrent. GM assigns P22D1, along with P22CF and P22D0, to its high-pressure turbine bypass actuator in the 2017 and 2018 diesel OBD tables, and boost control drops out of closed loop when the fault is active. The GM patent on series-sequential turbocharging describes a current sensor on this valve, which is how an overcurrent can be seen directly. Once the driver protects itself and shuts down, the valve no longer follows commands. Compared with its siblings, the search concentrates on positive-feed contact and the actuator winding. No public source gives GM's threshold values for P22D1.
- What you may notice
- Check engine light on
- Reduced power, boost control in fallback mode
- Fault comes back as soon as the valve is driven
- Likely causes
- LikelyActuator wire shorted to a battery-voltage feed
- PossibleActuator winding shorted or mechanically jammed, drawing overcurrent
- 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: €40 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.