P00D8
Turbocharger/Supercharger Bypass Valve B Temperature Too High
Turbocharger/Supercharger Bypass Valve B Temperature Too High: the component is overheating, typically from extended load or slip. This affects turbo/supercharger boost-pressure control.
- 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.
- Cooling system inadequateCommon
Parts involved
- Bypass Valve B
- Intercooler
P00D8 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.