Boost · Severity: High
P0234 — Turbocharger Overboost Condition
Boost pressure exceeds the maximum value expected by the ECU.
Common symptoms
- Limp mode
- Surging
- Whistling or flutter
Likely causes
- Sticking VGT vanes
- Faulty boost control solenoid
- Wastegate stuck closed
- Faulty boost pressure sensor
First test to run
Log commanded vs. actual boost and actuator duty; check the actuator moves freely across its full range.
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