Cold Start Turbocharger/Supercharger A Overboost
During cold start, turbocharger/supercharger A produces boost pressure above the cold-start target. Wastegate sticking closed or boost control overshoot.
Affected components
- Turbocharger a
- Wastegate a
Common causes
- High likelihood: Wastegate sticking closed at cold
- Medium likelihood: Boost control overshoot at cold
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.