P2C2CTurbocharger/Supercharger Bypass Valve B Position Sensor 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
- P2C2C flags a position signal from compressor bypass valve B that rises above the plausible top of its range, close to the sensor reference. A signal line touching 5 V or battery voltage, a broken ground wire or a defect inside the sensor are the typical findings. No manufacturer publishes P2C2C. GM's A-side counterpart P2BBD on the 2019 LT5 Corvette shows the pattern: a reading above 95 % in 10 out of 14 checks, one every 100 ms, relay voltage at least 11 V, no cranking, Type A. An Achates Power patent explains why a trustworthy reading matters: the controller compares commanded and measured opening to judge the valve. Unlike P2C29, the valve itself may still work; only its feedback is lost.
- What you may notice
- Check engine light
- Boost limited by the engine module
- Likely causes
- LikelySignal wire shorted to reference or battery voltage
- PossibleOpen ground of the position sensor
- PossiblePosition sensor failed high
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.