P0241 Turbocharger Boost Sensor B Circuit Range/Performance

Are you experiencing engine hesitation, surging, or lack of power, especially when accelerating or climbing hills? Does your vehicle’s check engine light (CEL) come on, with a diagnostic trouble code (DTC) of P0241? If so, you may have a problem with your turbocharger boost sensor B circuit. In this article, we will explain what this code means, how it affects your engine, and what steps you can take to diagnose and repair it.


A turbocharger is a device that uses exhaust gas to compress the air that enters the engine, thus increasing its power output. The boost sensor B is a component that measures the pressure of the air after the turbocharger, and sends a signal to the engine control module (ECM) to adjust the fuel and timing to match the desired boost level. If the ECM detects that the boost sensor B circuit is out of range or not performing as expected, it will set the P0241 code and illuminate the CEL.


There are several possible causes of the P0241 code, including:

  • A faulty boost sensor B: This can happen due to wear, corrosion, or damage to the sensor itself, or the wiring or connector that connects it to the ECM.
  • A vacuum leak: This can cause a reduction in the boost pressure, which can trigger the code. Check for disconnected or cracked hoses, leaking gaskets, or a faulty vacuum pump.
  • A clogged or leaking intercooler: If the air that enters the engine is not cooled properly, it can cause the pressure to drop. Check for debris, oil, or coolant in the intercooler, or leaks in the hoses or clamps.
  • A malfunctioning wastegate: The wastegate is a valve that regulates the flow of exhaust gas to the turbocharger. If it is stuck open or closed, it can affect the boost pressure. Check for proper operation and adjustment of the wastegate actuator.
  • A failed ECM: Although rare, it is possible that the ECM itself is not sending or receiving the correct signals for the boost sensor B circuit. This may require reprogramming or replacement of the ECM.


To diagnose the P0241 code, you will need a scan tool that can read live data from the ECM, and a vacuum/pressure gauge that can measure the boost pressure at the sensor. Here are the steps to follow:

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  1. Clear the code and see if it comes back: If it does, proceed to step 2.
  2. Check the boost sensor B circuit: Use a multimeter to measure the voltage and ground signals from the sensor to the ECM. Compare them to the specifications in the service manual. If they are out of range, replace the sensor. If they are within range, proceed to step 3.
  3. Check the boost pressure: With the engine running, measure the boost pressure at the sensor using the vacuum/pressure gauge. Compare it to the specifications in the service manual. If it is too low or too high, check for the causes listed above. If it is within range, proceed to step 4.
  4. Check the ECM: Use the scan tool to monitor the signals from the boost sensor B circuit and the other related sensors. Check for any anomalies or inconsistencies. If necessary, perform a software update or replace the ECM.


After you have identified and fixed the cause of the P0241 code, you should clear the code and test drive the vehicle to see if the symptoms have been resolved. If so, you have successfully repaired the turbocharger boost sensor B circuit range/performance problem. If not, you may need to repeat the diagnosis process or seek assistance from a qualified mechanic.


The P0241 code is a common issue for turbocharged vehicles, but it can be confusing and frustrating to diagnose and repair. By understanding the causes, symptoms, and diagnostic procedures described in this article, you can save time, money, and headaches. Remember to use quality parts, tools, and techniques, and to follow the manufacturer’s instructions and safety precautions. A properly functioning turbocharger boost sensor B circuit is essential for the optimal performance, efficiency, and longevity of your engine.


  1. Is the P0241 code serious?

Yes, it can lead to reduced power, fuel economy, and reliability of your engine. Ignoring the code can also cause damage to other components, such as the turbocharger, intercooler, or engine.

  1. Can I drive with the P0241 code?

You can, but it is not recommended, especially if you notice any symptoms of reduced boost or acceleration. You may also fail an emissions test or trigger other codes.

  1. How much does it cost to replace a boost sensor B?

The cost can vary depending on the make and model of your vehicle, the location and accessibility of the sensor, and the labor rates of the repair shop. Expect to pay anywhere from $50 to $300 for the sensor alone, and up to $500 for the total repair.

  1. Can I clean a clogged intercooler myself?

It is possible, but it requires some skill and tools. You may need to remove the intercooler from the vehicle, flush it with a cleaning solution, and rinse it thoroughly. It is also important to check for any leaks or damage to the intercooler.

  1. How can I prevent the P0241 code from recurring?

You can maintain your engine and turbocharger by following the recommended service intervals, using quality oil and filters, avoiding harsh driving conditions, and inspecting the boost sensor B circuit and related components regularly. You can also use a scan tool to monitor the boost pressure and other parameters of your engine.