P2C2DTurbocharger/Supercharger Bypass Valve B Position Exceeded Learning Limit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Electrically positioned compressor bypass valves have their end stops relearned regularly so that the sensor reading can be converted into a true opening. P2C2D means that for valve B, belonging to the second charger, a learned stop came out beyond the allowed window. No manufacturer documents the B-side code. GM shows the routine for valve A on the 2019 Corvette ZR1: once the engine is switched off, the module first drives the valve closed and stores the reading, which must lie between 85 and 95 %, then the open stop, expected between 10 and 20 %; a value outside sets P2BBE immediately as Type A, provided no sensor or circuit fault is active. Deposits, a bent flap, gear wear or a shifted sensor are typical causes. A repair is only confirmed after the next key-off learn.
- What you may notice
- Check engine light after a key-off
- Boost control less precise, possible surge noise
- Likely causes
- LikelyCarbon or oil deposits preventing the valve from reaching its stop
- PossibleWorn actuator gear or loose sensor magnet
- RareValve replaced without relearn or with incorrect part
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.