Turbocharger/Supercharger Wastegate A Stuck Closed
Wastegate A is mechanically stuck closed. The turbo cannot bleed off exhaust at high load — boost overshoots the setpoint, risking overboost cut-off and damage to the turbo bearing. Carbon-locked flap, seized linkage or aged actuator are typical causes.
Affected components
- Wastegate a
- Turbocharger a
Common causes
- High likelihood: Carbon-locked wastegate flap
- Medium likelihood: Seized linkage
- 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.