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P0234 is a diagnostic trouble code (DTC) for "Engine Overboost Condition". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Engine Overboost Condition
P0234 is a generic OBD-II code that is triggered when the Engine Control Module (ECM) detects that the intake boost pressure sensor input signals intake pressure above the maximum specified pressure by 4 psi for more than 5 seconds.
The turbocharger/supercharger wastegate is damaged or sticking
The wastegate control valve solenoid is sticking
The wastegate control hose is getting blocked and the boost pressure cannot be relieved quickly enough
The Check Engine Light will be illuminated and the P0234 code will be set in ECM memory.
The engine overboost condition may cause gaskets or seals to the intake or heads to fail.
The engine may run normally until the excessive overboost pressure blows out a gasket or seal.
Scans codes and documents the freeze frame data in order to verify the problem
Clears the codes to verify whether the concern comes back
Checks the operation of the boost pressure solenoid for proper operation of the wastegate
Checks the wastegate for sticking or binding
Check the wastegate relief hose for kinks, blockage or damages
Follow these simple guidelines to prevent misdiagnosis:
Check the boost pressure sensor hose for obstructions or kinks
Verify that the overboost pressure condition is not from boost pressure sensor incorrect input voltage
Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM
Replacing the wastegate control solenoid if it is sticking
Replacing the wastegate valve if it is sticking or binding
Repairing or replacing wastegate hoses due to kinks or blockage of the wastegate lines
Code P0234 is triggered by the intake boost sensor indicating an overboost condition and the most common failure is the wastegate binding or sticking intermittently.
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