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P0240 is a diagnostic trouble code (DTC) for "Turbocharger Boost Sensor B Circuit Range/Performance". 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 $79.99. 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 Range/Performance
P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost pressure sensor B input circuit range or performance to be out of specifications when compared to the manifold pressure sensor (MAP) or the barometric pressure sensor (BARO) at idle and with the key on, engine off, before the engine is started.
The turbo boost pressure sensor B does not correlate the same voltage input to the ECM with the MAP or BARO sensors at engine idle or when the key is on and the engine is off.
The turbo boost pressure sensor B is contaminated or clogged with debris or carbon deposits.
The turbo boost pressure sensor B is slow to respond to changing pressure from deterioration with age.
The Check Engine Light will be illuminated and code P0240 is set in ECM memory.
The engine turbo boost may be turned off by the ECM and the engine will lack power.
The engine may lack some power during acceleration if the boost sensor is failing to register the correct amount of boost pressure.
Scans codes and document 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 sensor compared to the MAP sensor.
Checks the turbo boost sensor for blockage of the sensor port, or boost sensor hose or line.
Checks the turbo boost sensor connector for loose or corroded pins in the connector.
Checks the sensor pressure lines for kinks or damaged lines.
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 clean and secure, and the pressure hose is not leaking, kinked or cracked.
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 due to kinks or blockage of the lines
Code P0240 is triggered by the intake boost sensor indicating a range or performance problem that the ECM determines is out of known specifications. The most common failure is the boost sensors slow response due to lower performance issues with the sensor as it ages.
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