Turbocharger/Supercharger Boost Pressure B Not Detected – Mechanical
The boost pressure on branch B is not detected during operation. Mechanical fault — turbo seized, charge pipe disconnected, or wastegate fully open.
Affected components
- Turbocharger b
- Wastegate b
- Boost pressure sensor b
Common causes
- High likelihood: Turbocharger B seized
- Medium likelihood: Charge pipe disconnected
Possible symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.