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P0238 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.


We’ll start by defining the DTC code P0238. Diagnostic trouble codes, or DTCs, are data from your vehicle’s onboard computer ECU indicating specific problems. P0238 is the turbocharger Boost Sensor A code, which corresponds to this circuit and signals a very high voltage condition.


It is essential to understand the meaning of P0238 codes in order to diagnose and solve this problem. The principle of P0238 is to indicate that the turbocharger’s boost sensor will indeed send a signal voltage exceeding the anticipated range, which leads to sharp readings. The correct operation of the turbocharger system may be interrupted by this High voltage condition, which could affect your vehicle’s performance.


Let’s now examine the P0238 code’s common causes. This problem may be caused by a number of circumstances, including:

  • Faulty Turbocharger Boost Sensor: A faulty sensor might cause the ECU to receive signals with an overly high voltage.
  • Wiring or Connection Issues: High voltage signals in the turbocharger boost sensor circuit may be caused by corroded or damaged wiring, shoddy connections, or loose terminals.
  • Boost Pressure Abnormalities: P0238 can be set off by issues with the turbocharger itself, such as over-boosting.


You can find the problem early if you can identify symptoms connected to the P0238 error code. Typical signs include:

  • Decreased Engine Performance: You could notice a drop in power and slow acceleration in your car.
  • Check Engine Light: As a warning, the check engine light will come on.
  • Potential turbocharger issues include: High boost pressure can occasionally cause serious problems with the turbocharger system, such as excessive noise or smoke.


In order to achieve effective resolution of the P0238 code, it is essential that a correct diagnosis be made. The exact problem can be detected by a professional mechanic or diagnostic tool. In order to ascertain the root cause of a higher voltage condition, they usually conduct tests on turbocharger boost sensors, wiring, and associated components.

Common mistakes

It is essential to avoid common mistakes in the diagnostic and repair procedures so that time and resources are not wasted. Some common errors include overlooking loose connections, misdiagnosing the problem as a turbocharger issue when the sensor or wiring is at fault, or neglecting to check for boost pressure abnormalities.

How serious is this?

It is vital to understand the seriousness of the P0238 code. As long as your vehicle is still operational, ignoring it might lead to diminished engine performance, decreased fuel efficiency, and potentially damaged engines. In order to guarantee optimum vehicle performance, it is vital that this problem be dealt with as soon as possible.

What repairs can fix the codeS?

repair manuals

Depending on the underlying problem, a number of remedies can resolve the P0238 error code after diagnosis. Possible fixes might be:

  • If the turbocharger boost sensor is determined to be defective, replace it.
  • Replacing or repairing faulty connections or wiring in the sensor circuit.
  • Addressing any turbocharger problems, such as over-boosting, that could have led to the code.

Related codes

It is like getting an anonymous message from the internal workings of your vehicle when a car’s check engine light turns on. One such message may be a diagnostic trouble code: P0238 Diagnostic Trouble Code DNCT, to indicate that there is an excessive voltage condition on the turbocharger boost sensor A. However, it may provide valuable information about the health of your vehicle’s turbocharger system when you understand related DTC values to P0238.

  • P0237 Boost Sensor A Circuit Low: P0237 is substantially related to P0238, both with regard to the booster sensor A circuit. However, P0237 differs from the high voltage scenario of P0238 by showing a dim electrical condition in that circuit.

  • P0299 – Turbocharger/Supercharger A Underboost Condition: While not directly related to the boost sensor circuit, P0299 signifies an underboost condition in the turbocharger or supercharger system. It often appears alongside P0238 when a malfunctioning sensor falsely signals a high boost, triggering both codes.


To conclude, the P0238 DTC code indicates that there’s a problem at the Boost Sensor circuit, specifically with regard to the high voltage signal from the turbocharger. If this code is not complied with, it may result in poor engine performance and reduced fuel efficiency. It is possible to solve this problem in an effective manner if you can understand its meaning, the associated causes, symptoms, and necessary fixes so as to restore a functioning vehicle once more. 

If you encounter the P0238 code, seeking professional assistance for diagnosis and repair is recommended to resolve the problem accurately and maintain optimal vehicle performance.

P0238 Code – What Does It Mean & How To Fix It