P0234: Turbocharger/Supercharger 'A' Overboost Condition
Severity: high
What it means: Boost pressure went higher than the engine computer allows.
Safe to drive? Not recommended under load. Overboost can damage the engine. Drive gently to a shop.
Common symptoms
- Limp mode
- Check-engine light
- Surging power
Likely causes, ranked
- Wastegate stuck closed or actuator faultShop
- Boost control solenoid faultShop
- Faulty boost sensorShop
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What it means: Boost pressure went higher than the engine computer allows.
Severity: High. Safe to drive? Not recommended under load. Overboost can damage the engine. Drive gently to a shop.
DIY or shop?
Shop diagnosis is recommended.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic. This code can involve stalling, engine damage or loss of power. If the check-engine light is flashing, or the car stalls or runs badly, stop driving and have it inspected.
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