P0239 Fault Code

P0239 OBD-II Trouble Code Short Description

Turbocharger Boost Sensor B Circuit Malfunction

What does trouble code P0239 mean?

The P0239 fault code on cars indicates that there is a malfunction in the circuit of the turbocharger boost sensor B. This sensor is responsible for monitoring the pressure of the turbocharger. When this code appears, it means that the signal from the sensor to the engine control module is outside the expected range.

The most common causes of this error include a faulty boost sensor, a damaged wiring harness, or a problem with the engine control module. Some symptoms of this error may include a lack of power, decreased fuel efficiency, or even stalling.

To solve this problem, a mechanic will need to perform a diagnostic test to determine the exact cause of the error. They may need to replace the boost sensor, repair or replace any damaged wiring, or reprogram the engine control module.

It is important to address this error as soon as possible to prevent further damage to the vehicle and ensure that it continues to run safely and efficiently.


What are the symptoms of the P0239 code?

The symptoms of a P0239 fault code on cars may include:

  • Check engine light is on
  • Reduced engine power
  • Poor acceleration
  • Rough idling or stalling
  • Engine overheating or running hot
  • Decreased fuel efficiency
  • Whistling or hissing sounds coming from the engine or turbocharger
  • Turbocharger not engaging or working properly.


What causes the P0239 code?

The P0239 fault code on cars is caused by a malfunction in the circuit of the turbocharger boost sensor B.

Some common causes of this error include:

  • Faulty turbocharger boost sensor B
  • Wiring issues in the turbocharger boost sensor B circuit
  • Loose or corroded electrical connections in the sensor circuit
  • Clogged or dirty turbocharger

In order to properly diagnose and repair this issue, it's recommended to take your vehicle to a certified mechanic or dealership. They will be able to use diagnostic equipment to identify the specific cause of the fault code and perform any necessary repairs.

Possible Solutions

How to fix P0239?

To fix the P0239 fault code on cars, you should:

  1. Inspect the wiring and connections for damage or looseness in the boost sensor circuit.
  2. Test the turbocharger boost sensor to ensure it is functioning correctly. If it is not, replace the sensor.
  3. Check for vacuum leaks and repair them if found.
  4. Inspect the turbocharger waste-gate control, as a malfunction in this component can also cause this code to appear.
  5. Use a code reader or scanner to clear the codes and see whether the issue persists.