P0234Cars & SUVs
HardP0234 — Turbocharger overboost condition
Boost pressure exceeds the safety limit. The ECM may cut power to protect the engine. Left alone, it can damage the turbo or pistons.
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Likely causes
- Wastegate actuator or VGT stuck closed
- Faulty MAP/boost sensor sending a false signal
- Boost-control system modified or deleted
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Recommended checks
- 1
Verify wastegate/VGT actuator operation
- 2
Compare actual boost to the MAP sensor signal
- 3
Restore boost control to OEM specifications
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Parts to replace
Wastegate/VGT actuator
Boost pressure sensor
Turbocharger