Turbocharger/Supercharger A Turbine Overspeed
The turbocharger A turbine speed exceeded its safe limit. Risk of bearing damage and shaft fracture. Often caused by a stuck-closed wastegate or boost control fault.
Affected components
- Turbocharger
- Wastegate
- Turbine speed sensor
Common causes
- High likelihood: Wastegate stuck closed
- Medium likelihood: Boost control loop fault
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
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.