P023D - OBD Trouble Code

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If you experience exponential drop in the fuel economy, and your car engine is stalling with improper throttle response and Check Engine Light turned on. It might be an indicative to OBD Code P023D error.

OBD-II Code Decreased engine performance is defined as a Manifold Absolute Pressure - Turbocharger/Supercharger Boost.

OBD-II equipped vehicle which has stored a code P023D, means that the powertrain control module (PCM) has detected a discrepancy in the correlating signals between the manifold absolute pressure (MAP) sensor and the turbocharger/supercharger boost sensor which has been designated "A".

The "A" denotes a specific boost sensor in a system which uses multiple boost sensors in different locations. This code is applicable only to vehicles that are equipped with forced air induction devices. Forced air induction devices include turbochargers and superchargers.

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

• Burnt, damaged, shorted, disconnected, or corroded wiring and/or connectors
• Faulty Manifold Absolute Pressure (MAP) Sensor
• Vacuum leaks caused by damaged, split, dislodged, hardened, or perforated vacuum lines
• Insufficient vacuum due to a defective vacuum pump
• Defective vacuum actuator and vacuum control solenoid
• Defective stepper motor
• Mechanical defects of the variable vanes
• Mechanical failure of the turbocharger itself
• Defective, or malfunctioning boost pressure or turbine speed sensor
• Restricted intercooler PCM or PCM needs reprogramming
• Clogged catalytic converter

1. Turbocharger - It’s a forced induction device that increases an internal combustion engine's efficiency and power output by forcing extra air into the combustion chamber. Replace your old turbochargers with us!
2. Supercharger - Supercharger is an air compressor that increase the air pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, thus increasing power. Replace damaged supercharger and parts today!
3. Powertrain Control Module - P023D error code also relates to problems with the powertrain. Find all the Powertrain related parts with us.
4. Vacuum Hose Kit - The most common problem is of the vacuum leak due to broken, torn or disconnected vacuum hose or tube. This usually happens due to extreme heat generated in the internal combustion engine. Find quality vacuum hose kits with us.
5. Intake Manifolds - Replace damaged or old air intake manifolds as it adversely affects the engine’s performance. Visit us today!
6. Boost Control Sensor - This sensor checks for the pressure of air and informs the ECU, which further calculates the exact amount to be mixed with fuel for maximum output. Thus, wrong data can be bad and thus it need immediately change. Buy new sensors form us now!
7. Vacuum Pressure Gauge - Inspect if the gauge is displaying the correct reading and replace if not. Buy new gauge from us.
8. Manifold Absolute Pressure Sensor - If the MAP sensor faulty, it might not function properly and the PCM might get wrong data. Thus, replace faulty now!
9. Diagnostic Tools - Quality OBD scan tools are necessary to diagnose a problem. Buy factory grade diagnostic tools from us now!

Typical symptoms of code P023D are much the same across all applications, although the severity of one or more symptoms may vary between applications. Below are some typical symptoms associated with this code-

Common Symptoms

• Decreased engine performance
• Excessive rich or lean exhaust
• Delayed engine start-up (especially when cold)
• Diminished fuel efficiency
• Engine Light ON (or Service Engine Soon Warning Light)

Following are the ways to correct OBD code P023D error:

• Test the 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.
• Consult your vehicle information source for component testing specifications.
• MAP/ turbocharger/supercharger boost sensors that fail to comply with the manufacturer’s specifications must be replaced.
• Test for reference voltage (typically 5-volts) and a ground at sensor connectors.
• 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.
• Sensors which fail to reflect the degree of voltage (according to manifold absolute pressure and turbocharger/supercharger boost pressure) specified by the manufacturer, 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.

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P023D is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.

Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple steps such as:

• Record all fault codes present, as well as all available freeze frame data. This information can be of use should an intermittent fault be diagnosed later on.
• Knowing how variable boost control systems work makes diagnosing faults in the system considerably easier, so spend an hour or so reading the relevant section(s) in the repair manual, and be sure to use the manual to locate all the parts and components that make up the system. Do not proceed to next step without understanding of how the system works, where all the components that make up the system are located, and how these components interact to make the system work as intended.
• The variable boost control system will either be vacuum -, or electrically operated, so once you have identified the various components
• If the stepper motor does not rotate freely, or does not rotate at all, consult the manual to determine the correct procedure to test the resistance, and continuity of the motor, as well as all associated wiring, sensors, and connectors. Be sure however to disconnect the boost control system from the PCM and other relevant controllers during this step to prevent damage to the controller(s).
• If the variable boost control system is vacuum controlled, locate all associated vacuum hoses, actuators, and control solenoids. Inspect all vacuum hoses for visible damage such as splitting, cracking, hardening, or perforations, and replace all hoses and lines as required.
• If no damage to vacuum lines is found, locate the vacuum actuator that controls the variable vanes, and connect the vacuum pump to it where the vacuum system normally attaches to the actuator.

Common Mistakes When Diagnosing OBD Code P023D

Always take assistance of a qualified technician to know the problem to this error. Never lose sight of the symptoms and never be in hurry to come to a conclusion as sometimes very small issue can lead to flashing of the OBD errors. Some of the major mistakes related to code P023D are mentioned below.

• Replacement of the Turbochargers without checking the associated wirings and terminals.
• Powertrain Control Module (PCM) replacement without inspecting the sensors and data transmission units.
• Worn out and damaged wiring and connectors not checked and replaced.

P023E - Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor "B" Correlation