P22CFTurbocharger Turbine Inlet 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
- P22CF points to an open drive circuit of the turbocharger turbine inlet valve, the exhaust-side valve that either lets gas skip the small first-stage turbine of a series two-stage system or isolates a second turbine in a parallel-sequential layout. GM's diesel OBD tables (17OBDG04 and 18OBDG04) group P22CF, P22D0 and P22D1 as the faults of the high-pressure turbine bypass actuator (HTB); while one is active, boost control leaves closed-loop operation. A GM patent on a series-sequential turbo shows this bypass valve with both a current sensor and a position sensor. With the circuit open the valve sits in its spring position, often causing slow boost or a power cap. No public source gives GM's thresholds for P22CF; the electrical check runs whenever the actuator is in use.
- What you may notice
- Check engine light on
- Reduced power, boost control in fallback mode
- Turbo lag or a missing second-stage push
- Likely causes
- LikelyActuator connector loose, heat-damaged or corroded
- PossibleBroken wire near the exhaust manifold or turbo
- PossibleOpen winding in the turbine valve actuator or its control solenoid
- 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.