P2CD5
Turbocharger/Supercharger Bypass Valve C Stuck
The turbocharger/supercharger bypass valve C is mechanically stuck. Boost recirculation on this branch cannot be commanded.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Common causes
Ordered by how often each turns out to be the cause.
- Bypass valve mechanically seizedCommon
- Carbon deposits jam the valvePossible
Parts involved
- Turbo Bypass Valve C
P2CD5 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.