P2C2ETurbocharger/Supercharger Bypass Valve B Supply Voltage 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
- P2C2E concerns the power stage of compressor bypass valve B, not its position signal. Such valves are moved by a small DC motor driven through an H-bridge, and the bridge reports when its own supply sags below a safe level. No manufacturer documents the B-side code publicly. GM's 2019 LT5 tables describe the equivalent for valve A (P2BBF): the motor driver flags low voltage in 80 of 100 checks spaced 12.5 ms apart, enabled at relay voltage of at least 11 V without cranking, Type A. NXP's MC33926 data sheet shows how a bridge of this kind disables its outputs under undervoltage and signals the fault. A weak battery feed, a poor module ground, a corroded relay or an internal driver fault are typical causes; the valve then remains in its last position.
- What you may notice
- Check engine light
- Valve no longer responds, boost reduced
- Often accompanied by other low-voltage codes
- Likely causes
- LikelyWeak battery or voltage drop on the module feed
- PossiblePoor ground or corroded relay contacts in the supply
- RareInternal fault of the H-bridge driver
- 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: €40 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.