P2C7CTurbocharger Turbine Inlet Valve Supply 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
- P2C7C reports that the voltage feeding the turbine inlet valve actuator is too low. Electric turbo actuators of this kind combine a DC motor, gearing and a position sensor and rely on a stable feed; BorgWarner's patent on such an actuator adds a spring that returns the valve to a default position when power is lost. No manufacturer documents P2C7C publicly. GM uses a comparable check on the exhaust pressure valve of its 3.0-litre diesel (P2B98, table 25OBDG04B): a fault when the motor supply drops below 6 V in 240 of 300 samples while the main relay delivers more than 11 V, Type A. Likely culprits are a blown fuse, a weak relay, corroded pins or a broken feed wire; a flat battery alone should not cause it. Boost control is curtailed. Faults in the control lines are P22CF to P22D1.
- What you may notice
- Check engine light
- Low boost and reduced power
- Further turbo actuator codes stored at the same time
- Likely causes
- LikelyBlown fuse or faulty supply relay for the actuator
- PossibleCorroded or loose pins at the actuator connector
- PossibleChafed or broken feed or ground wire near the hot turbo area
- RareDefective supply output in the 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: €10 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.