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What are the causes of P023400 turbocharger overboost?

1 Answers

DelPresley

07/29/25 11:05am

P023400 turbocharger overboost may occur due to the following reasons: 1. If the wastegate or wastegate regulating valve malfunctions, it may cause the system to overboost. 2. Possible causes include misfire conditions exceeding calibrated thresholds, knock sensor circuit failure, low-speed fuel pump relay failure, transmission oil temperature exceeding normal range, turbocharger pressure regulating valve failure, etc. Additional information: 1. When P023400 turbo is in overboost condition, the turbocharger utilizes exhaust gas inertia from the engine to drive the turbine, which in turn drives the coaxial impeller to boost intake pressure, thereby increasing vehicle power. 2. To prevent turbo overboost, when pressure reaches the preset maximum value, the air pressure will actuate the wastegate actuator (pneumatic-mechanical type) to divert some exhaust gas away from the turbine, thereby reducing turbine speed and decreasing boost level.

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