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P0239 is a diagnostic trouble code (DTC) for "Turbocharger Boost Sensor B Circuit Malfunction". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Turbocharger Boost Sensor B Circuit Malfunction
P0239 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects an intake boost pressure sensor B input malfunction when compared to the manifold pressure sensor (MAP) when the engine is at idle; turbocharger boost should be zero.
The turbo boost sensor B and the MAP sensor voltage input do not correlate the same reading with the engine at idle or when the key is first turned on and the engine is off.
The turbo boost pressure sensor B is contaminated or clogged.
The turbo boost pressure sensor B is slow to respond to changing pressure, most likely from age deterioration.
The Check Engine Light will be illuminated and the code will be set in memory.
The engine turbocharger boost pressure may be turned off by the ECM causing the engine to lack power on acceleration.
Follow these simple guidelines to prevent misdiagnosis:
Check the boost pressure sensor hose for obstructions or kinks.
Verify the electrical connections to the sensor are secure and pressure hoses are not leaking or kinked.
Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM
Repairing or replacing the hoses and connections to the turbo boost sensor if kinks or blockage of the lines are present
Repairing the wiring to the sensor or replacing the connection
Code P0239 is triggered by the intake boost sensor B indicating a malfunction condition that the ECM cannot determine the true cause. The most common failure is the boost sensor in most cases.
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