P0235 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit Malfunction

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Cost of diagnosing the P0235 code

P0235 is a diagnostic trouble code (DTC) for "Turbocharger Boost Sensor A 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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BMW$70.00$30.00
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Check Engine Light

P0235 code definition

Turbocharger Boost Sensor A Circuit Malfunction

What the P0235 code means

P0235 is an OBD-II generic code that is triggered when the Engine Control Module (ECM) detects intake boost pressure sensor A input malfunction when compared to the manifold pressure sensor (MAP) at idle, and with the key turned on before starting the engine.

What causes the P0235 code?

  • The turbo boost sensor and the MAP sensor do not correlate the same reading with the engine at idle and when the key is on and the engine is off.

  • The turbo boost pressure sensor A is contaminated or clogged

  • The turbo boost pressure sensor A is slow to respond to changing pressure

What are the symptoms of the P0235 code?

  • The Check Engine Light will be illuminated and the P0235 code 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

How does a mechanic diagnose the P0235 code?

  • 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 sensor compared to the MAP sensor
  • Checks the turbo boost sensor for blockage of the sensor port
  • Checks the turbo boost sensor connector for loose or corroded pins

Common mistakes when diagnosing the P0235 code?

Follow these simple guidelines to prevent misdiagnosis:

  • Check the boost pressure sensor hose for obstructions or kinks
  • Verify that the connections to the sensor are secure and not leaking or kinked

How serious is the P0235 code?

  • The boost pressure in the intake can give you a lot of power. If the turbo boost sensor is malfunctioning, then the ECM may disable the turbo boost and you would have a lack of power.

What repairs can fix the P0235 code?

  • Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM

  • Repairing or replacing hoses and connections to the turbo boost sensor that have kinks or blockage of the lines

Additional comments for consideration regarding the P0235 code

Code P0235 is triggered by the intake boost sensor indicating a malfunction condition of which the ECM cannot determine the cause. The most common failure is with the boost sensor.

Need help with a P0235 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
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P0235

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