P0234: Turbocharger engine overboost condition
Stop driving. Get it towed or fixed first.
Can I drive with P0234?
No, stop driving safely as soon as possible. Excessive boost pressure can blow head gaskets or crack engine pistons under load.
What does P0234 mean?
P0234 stands for Turbocharger/Supercharger 'A' Overboost Condition.
Symptoms you may notice
- Severe loss of passing power and sluggish acceleration
- Whooshing or fluttering air sounds when accelerating or releasing gas
- Engine feels like a non-turbo motor without boost
How much does it cost to fix?
Repair costs for code P0234 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Stuck closed wastegate or seized actuator
- Disconnected wastegate vacuum/boost reference hose
- Defective boost control solenoid (N75)
- Aftermarket engine tuning pushing beyond limits
What to do next
- Avoid wide-open throttle or heavy acceleration immediately.
- Inspect the wastegate control arm for mechanical binding.
- Check rubber boost lines feeding the wastegate actuator.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0234 means the turbocharger is producing far more boost pressure than the engine can tolerate. Overboost causes extreme cylinder pressure and detonation, which can quickly destroy ringlands or blow cylinder head gaskets. Drive very gently without engaging boost.