Turbocharger Bypass Valve A Stuck
The turbocharger bypass valve A (compressor bypass for surge protection or wastegate-style boost relief) is mechanically stuck. Boost control is impaired - either no relief on overspeed or no boost build-up depending on which position the valve is stuck in.
Affected components
- Turbo bypass valve a
Common causes
- High likelihood: Valve stuck due to debris or actuator failure
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
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.