Turbocharger/Supercharger Wastegate A Stuck Open
Wastegate A is mechanically stuck open. Exhaust gas bypasses the turbine even at low load — turbo cannot reach target speed, boost is permanently low and the engine feels asthmatic. Common causes are seized linkage, broken return spring or carbon-locked wastegate flap.
Affected components
- Wastegate a
- Turbocharger a
Common causes
- High likelihood: Seized wastegate linkage
- Medium likelihood: Broken return spring
- Low likelihood: Carbon or debris buildup preventing free movement
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
Related codes
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.