P023E Fault Code

P023E OBD-II Trouble Code Short Description

Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation

What does trouble code P023E mean?

The P023E fault code is a diagnostic trouble code (DTC) that is set in the engine control module (ECM) when there is a correlation problem between the Manifold Absolute Pressure (MAP) sensor and the Turbocharger/Supercharger Boost Sensor B. This means that the ECM has detected a discrepancy in the readings between the two sensors and has determined that there is a problem with the turbocharging system.

One of the most common causes of this fault code is a faulty MAP sensor or boost sensor B, which can cause the ECM to receive inaccurate readings and result in poor engine performance. Other possible causes include wiring issues, vacuum leaks, clogged air filters, or a damaged turbocharger or intercooler.

To fix this problem, the root cause of the issue must first be identified and addressed. This may involve replacing a faulty sensor, repairing damaged wiring, or replacing a damaged turbocharger or intercooler. Once the issue is resolved, the DTC should be cleared from the ECM's memory using a diagnostic scan tool. If the problem persists, further diagnosis may be necessary to locate any underlying issues with the turbocharging system.


What are the symptoms of the P023E code?

Symptoms of the P023E fault code on cars include:

  • Check engine light is on
  • Decreased engine performance and acceleration
  • Poor fuel economy
  • Turbocharger/supercharger may not be functioning properly
  • Engine may go into power reduction mode
  • Rough idling or stalling at low speeds


What causes the P023E code?

Possible causes of the P023E fault code on cars include:

  • A faulty or failing turbocharger or supercharger boost sensor
  • Corroded or damaged wiring or connectors in the boost sensor circuit
  • A vacuum leak in the intake or boost system
  • A malfunctioning turbocharger wastegate or variable geometry turbo mechanism
  • A clogged or leaking air filter or intake duct
  • A malfunctioning manifold absolute pressure (MAP) sensor
  • A malfunctioning engine control module (ECM) or powertrain control module (PCM)

Possible Solutions

How to fix P023E?

To fix the P023E fault code on cars, the following steps can be taken:

  1. Check the wiring: Ensure that there are no loose or damaged wires in the MAP sensor harness. Repair any damages found.

  2. Check the MAP sensor: Use a scan tool to check the readings from the MAP sensor. If the readings do not match the specifications for your vehicle, replace the sensor.

  3. Check for vacuum leaks: A vacuum leak will cause a drop in manifold pressure, which can trigger the P023E code. Inspect all vacuum lines and connections for leaks.

  4. Check the turbocharger/supercharger system: If your vehicle is equipped with a turbocharger or supercharger, inspect the system for leaks or other issues that may be causing the fault code.

  5. Check for software updates: Some vehicles may require a software update from the manufacturer to resolve this code.

If all else fails, it may be necessary to take the vehicle to a qualified mechanic or dealership for further diagnosis and repair.


  • What does P023E code indicate?

    P023E code indicates a correlation issue between the manifold absolute pressure sensor and the turbocharger/supercharger boost sensor B.

  • What causes P023E code?

    The P023E code can be caused by various factors such as a faulty MAP sensor, turbocharger/supercharger boost sensor B, wiring issues, or sensor misalignment.

  • What are the symptoms of P023E code?

    The symptoms of P023E code are reduced engine performance, engine hesitation, rough idling, decreased fuel efficiency, and illuminated check engine light.

  • How to diagnose P023E code?

    Diagnosing the P023E code requires using an OBD-II scanner to retrieve the code and then performing various tests such as visual inspection of wiring, testing sensor output, testing sensor resistance, and repairing/replacing faulty components.

  • Can P023E code be ignored?

    The P023E code should not be ignored as it can negatively affect the engine's performance and fuel efficiency. It is recommended to fix the issue as soon as possible.

  • How to fix P023E code?

    The fix for the P023E code depends on the underlying cause of the issue. It can involve repairing or replacing faulty sensor/wires, realigning the sensors, or getting a professional mechanic to diagnose and fix the issue.

  • Can I drive with a P023E code?

    It is not recommended to drive with a P023E code as it can adversely affect your engine's performance and fuel economy. It is better to fix the issue before driving.

  • How much does it cost to fix the P023E code?

    The cost of fixing the P023E code depends on the underlying cause and the extent of the issue. It can range from $100 to $500 depending on the repair/replacement needed.