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P0240 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


Let’s first clarify the meaning of the P0240 DTC code in terms of vehicle diagnostics. DTCs are numerical codes that act as alerts for particular systemic problems in your car. Specifically, P0240 refers to an issue with the Turbocharger Boost Sensor B Circuit.


The DTC code P0240 appears to indicate an issue with the engine’s Boost Sensor B circuit. The sensor has a critical role to play in monitoring and controlling the air pressure inside the engine intake manifold. If there are problems with this circuit, it may lead to difficulties in performance and reduced fuel efficiency.


Effective diagnosis and repair of the P0240 DTC code depend on an understanding of its possible causes. Typical reasons include:

  • Faulty Turbocharger Boost Sensor: This code is caused by a faulty turbocharger boost sensor, which may be the result of wear and tear or electrical problems.
  • Wiring or Connector Problems: The Turbocharger Boost Sensor B Circuit’s operation might be hampered by faulty wiring or connectors.
  • Vacuum Leaks: The accuracy of the sensor might be impacted by any leaks in the vacuum lines going to it.
  • Turbocharger Issues: The P0240 error code can also be caused by issues with the turbocharger itself, such as boost leaks or wastegate issues.


Experiencing symptoms related to the P0240 DTC code can help you identify the issue. Common symptoms include:

  • Reduced engine power
  • Poor acceleration
  • Increased fuel consumption
  • Illuminated check engine light
  • Potential engine knocking or pinging noises


The P0240 DTC code must be diagnosed in order to determine its precise cause. Typically, this entails:

  • Code Scanning: Retrieve the code and look for similar codes by using an OBD-II scanner.
  • Visual Inspection: Check for obvious damage to the Turbocharger Boost Sensor and associated connections.
  • Examining: To find problems, examine the vacuum lines and electrical circuits of the sensor.
  • Turbocharger Inspection: If necessary, check the turbocharger for issues that might influence the sensor in a side-effect manner.

Common mistakes

Avoiding common mistakes in the diagnostic and repair processes is crucial:

  • Neglecting the Visual Inspection: Skipping the visual inspection can lead to overlooking obvious issues.
  • Replacing Parts Unnecessarily: Don’t replace the sensor right away without conducting the necessary tests; it could not always be the main issue.
  • Ignoring Related Codes: Look for any Related Codes and address them, as they can contain important hints.

How serious is this?

The seriousness of the DTC P0240 code has to do with how it is handled. Over time, ignoring it can result in reduced engine performance, increased fuel consumption, and the potential for engine damage. In order not to create any additional complications, it is important that this issue be addressed promptly.

What repairs can fix the codeS?

repair manuals

Once the issue has been diagnosed, appropriate repairs can be carried out. Depending on the cause, these repairs may include:

  • Replacing the Turbocharger Boost Sensor
  • Repairing or replacing damaged wiring or connectors
  • Fixing vacuum leaks
  • Addressing turbocharger-related problems

Related codes

In some cases, the P0240 DTC code may be accompanied by related codes, such as:

  • P0239: Turbocharger Boost Sensor A Circuit Range/Performance
  • P0241: Turbocharger Boost Sensor B Circuit Low
  • P0242: Turbocharger Boost Sensor B Circuit High

These related codes may provide additional information about the issue.


To conclude, the DTC code P0240 indicates that there is a problem with the Turbocharger Boost Sensor B circuits, leading to various performance problems. It is essential to understand its meaning, causes, symptoms, and diagnostic process in order to effectively resolve it.

To keep your vehicle running as efficiently as possible and to avoid further damage, you should immediately contact this code if it occurs. If you do not know how to diagnose or repair the problem yourself, always seek professional advice.

P0240 Code – What Does It Mean & How To Fix It