P2C2BTurbocharger/Supercharger Bypass Valve B Position Sensor 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
- With P2C2B the position signal of compressor bypass valve B lies below the lowest value a healthy sensor delivers. Likely reasons are a signal wire grounded against the engine, an open 5 V reference or a sensor that has failed low. For valve B no public manufacturer data exist. For valve A, GM's 2019 Corvette ZR1 (supercharged LT5) shows how such a test is built: a raw reading under 10 % of the reference in 10 of 14 samples taken 100 ms apart, only with relay voltage of at least 11 V and the engine not cranking, gives a Type A fault with immediate MIL (P2BBC). The open-circuit case is P2C2A, the high case P2C2C. Since valve position can no longer be confirmed, boost is typically reduced.
- What you may notice
- Check engine light
- Reduced boost pressure
- Likely causes
- LikelySignal wire of the position sensor shorted to ground
- PossibleMissing 5 V reference at the sensor
- PossiblePosition sensor in the valve actuator failed low
- 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.