Error Code P023E: What It Means & What To Do?

<<See All OBD Codes

Is your Check Engine Light illuminated on the car’s dashboard? Are you experiencing sudden drop in the fuel economy with stalling of the engine? Or is there any smoke coming from the exhaust pipe? Then, there might be a possibility of an issue with the Boost Control sensor/Circuit of the car thus indicating OBD Code P023E error.

This error usually occurs when the Engine Control Unit detects an out of range reading from the Boost Control Sensor ‘B’ Correlation and thus the code gets stored in the PCM (Powertrain Control Module). This causes abnormalities in the air pressure, which affects the air to fuel ratios and thus the combustion process, ultimately affecting the engine performance.

What causes the problem with MAP-Turbocharger/Supercharger Boost Sensor ‘B’ Correlation?

• Faulty Manifold Absolute Pressure Sensor (MAP)
• Manifold Absolute Pressure Sensor (MAP) harness is open or shorted
• Manifold Absolute Pressure Sensor (MAP) circuit poor electrical connection
• Faulty Turbocharger/Supercharger Boost Sensor
• Turbocharger/Supercharger Boost Sensor harness is open or shorted
• Turbocharger/Supercharger Boost Sensor circuit poor electrical connection
• Restricted intercooler PCM or PCM programming error

1. Engine Control Unit - If the ECU interprets the data wrongly, this can lead to improper air pressure thus hampering the performance. Replace faulty parts now!
2. Turbocharger - Faulty turbocharger will reduce the internal combustion of the engine, thus affecting the power output. If faulty, replace immediately.
3. Supercharger - Faulty supercharger will lead to less oxygen entering the combustion chamber, which will cause decreased power output. Replace faulty parts now!
4. Intake Manifold - Improper air to fuel ratios will not let the fuel burn properly and reduce engine power due to faulty air intake manifold. Thus, it should be replaced immediately.
5. Diagnostic Tools - Professional OBD scan tools are necessary to diagnose a problem. Buy quality diagnostic tools from us now!
6. Boost Control Sensor - Check if the sensor is working properly or not and replace as it is needed to give correct information to the PCM.
7. Vacuum Pressure Gauge - Change the damaged vacuum gauge if needed to maintain proper pressure situations. Buy form us now!
8. Manifold Absolute Pressure Sensor - Affected MAP sensor has to be replaced immediately and it can cause serious performance issues. Replace now!
9. Powertrain Control Module - Check for PCM error and replace or reprogram it as required.

In addition to service/check engine soon lamp illumination, code P023E may lead to the following symptoms:

Common Symptoms

• Reduced engine performance
• Abnormal noises from the vehicle’s under hood
• Increased engine and/or transmission temperatures
• Emission of black smoke from the exhaust
• Faulty spark plugs
• Cylinder detonation due to increased engine temperatures
• Reduction in engine acceleration

Following are the steps to correct P023E code error:

• Inspect individual MAP/ turbocharger/supercharger boost pressure sensors using the DVOM and your vehicle information source. Place the DVOM on the ohms setting and test the sensors while they are unplugged and consult your vehicle information source for component testing specifications.
• Replace the MAP/ turbocharger/supercharger boost sensors that fail to comply with the manufacturer’s specifications.
• Test for reference voltage (typically 5-volts) and a ground at sensor connectors and use the DVOM and connect the positive test lead to the reference voltage pin of the sensor connector with the negative test lead connected to the ground pin of the connector.
• Reconnect the sensor and test the sensor signal circuit with the engine running. Follow the temperature to voltage chart found within the vehicle information source to determine if the respective sensors are functioning properly.
• If the sensor fails to reflect the degree of voltage (according to manifold absolute pressure and turbocharger/supercharger boost pressure) specified by the manufacturer, it must be replaced.
• Test the signal circuit (for the sensor in question) at the PCM connector. If there is a sensor signal at the sensor connector and none at the PCM connector, there is an open circuit between the two components.
• Test individual system circuits using the DVOM. Disconnect the PCM (and all related controllers) and follow the diagnostic flow chart or connector pin diagrams to test individual circuit resistance and/or continuity.
• Check technical service bulletins (TSB) for help with your diagnosis.
• The turbocharger/supercharger boost sensor is often left unplugged after air filter replacement and other related maintenance.

At Parts Avatar Canada, get quality replacement parts and performance parts at the best prices for all your car makes and models.

Always use an OBD-II scanner to identify the code, then reset the code and test the vehicle to see if the code returns.

If the P023E code returns, then the mechanic should follow the test procedure:

• Check the turbo or supercharger system for loose connections, including hoses and lines being cracked or damaged.
• Check the boost sensor wiring for loose connections, damaged wiring, or faulty sensor.
• Ensure that the boost pressure is not erratic during operation and driving for normal range of 9 to 14 PSI pressure.
• Examine the turbocharger for damaged blades, wobbly shaft rotation, worn bearings, oil leaks and correct control valve or wastegate operation.

Common Mistakes When Diagnosing OBD Code P023E

• Don’t assume the components to be bad without carefully inspecting the system first.
• Failure to flush all debris and obstructions from the turbocharger oiling system can lead to repeated turbo failure.
• Replacement of turbocharger without complete testing the bypass valve or wastegate function and electrical circuitry is also the cause of wrong diagnosis.

P023D - Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor "A" Correlation