Trouble codes › P0234
P0234 Turbocharger/Supercharger "A" Overboost Condition
Turbo
P0234 means turbo or supercharger boost went higher than allowed, usually a stuck wastegate or boost control problem.
Boost pressure went higher than the engine computer allows. It usually cuts power to protect the engine.
Drive gently. Overboost can damage the engine, and many vehicles cut power when it happens. Get it checked soon.
Common causes
- A wastegate stuck closed or its actuator failed
- A failed boost control solenoid or a disconnected control hose
- A faulty boost pressure sensor
- Aftermarket tuning raising boost
Symptoms
- Sudden loss of power (the computer limiting boost)
- Surging under acceleration
- Check-engine light
What to check first
- Check the wastegate and its actuator move freely.
- Inspect the boost control solenoid and its hoses.
- Compare boost pressure readings with spec during acceleration.
- If the engine has an aftermarket tune, return it to stock to test.
What does P0234 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
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Related codes
General guidance for P0234 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.