Powertrain
generic / SAE
P0234
Turbocharger/Supercharger "A" Overboost Condition
Boost pressure exceeded the upper limit during commanded full load. The ECU usually drops fuel and ignition or commands the wastegate fully open to protect the engine; persistent overboost can crack pistons or rings.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number2 / 34
Possible causes
- Wastegate stuck closed (carbon, broken linkage) high
- Boost control solenoid failed medium
- Vacuum/pressure line cracked medium
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2500 €
- Estimated time: 1.5–8 h
- Component: turbocharger
- Component: wastegate actuator
- Component: boost pressure sensor
- Component: vacuum lines
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012