Technical Description of OBD-II Trouble Code
The correlation between the Manifold Absolute Pressure – Turbocharger/Supercharger Boost Sensor B is causing this trouble code.
What does that signify?
This is a generic diagnostic trouble code (DTC) that is commonly found in OBD-II vehicles, including Land Rover (Range Rover, Discovery), Ford, Chevrolet, Mazda, Dodge, Peugeot, Saab, Toyota, and others.
The specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
If your OBD-II equipped vehicle has stored a code P023E, it means that the powertrain control module (PCM) has detected a discrepancy in the signals between the manifold absolute pressure (MAP) sensor and the turbocharger/supercharger boost sensor designated as “B”.
The “B” refers to a specific boost sensor in a system that may have multiple boost sensors in different locations. To determine which sensor the “B” references for your vehicle, consult a reliable vehicle information source. This code is applicable only to vehicles equipped with forced air induction devices such as turbochargers and superchargers.
The MAP sensor provides the PCM with a voltage signal that indicates the air density or pressure in the intake manifold. The voltage signal is received by the PCM in kilopascal (kPa) units or inches of mercury (Hg). In some vehicle applications, MAP is used as a substitute for barometric pressure and measured in similar increments.
The turbocharger/supercharger boost pressure sensor (designated B) is similar in design to the MAP sensor. It monitors the air density (boost pressure) inside the turbocharger/supercharger intake pipe and provides the PCM with an appropriate voltage signal.
A code P023E is stored and a malfunction indicator lamp (MIL) may illuminate if the PCM detects voltage signals between the MAP sensor and the turbocharger/supercharger boost sensor B that differ by more than a programmed degree. Multiple ignition cycles with a failure may be required for MIL illumination.
What is the severity of this DTC?
The conditions contributing to a code P023E can adversely affect overall engine performance and fuel efficiency. It should be considered a severe issue.
What are some of the symptoms of the code?
Symptoms of a P023E trouble code may include:
What are some of the common causes of the code?
Possible causes for this P023E trouble code may include:
What are some P023E troubleshooting steps?
Before attempting to diagnose a code P023E, it is recommended to have access to a diagnostic scanner, a digital volt/ohmmeter (DVOM), a manual vacuum pressure gauge, and a reliable vehicle information source. Diagnosing any MAP sensor related code should include checking if the engine is producing sufficient vacuum, which can be done using the vacuum pressure gauge.
If there are no intercooler obstructions and the air filter is relatively clean, a visual inspection of all MAP/turbocharger/supercharger boost sensor system wiring and connectors is necessary. Make any required repairs. Next, connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. Freeze frame data provides a snapshot of the exact circumstances that were occurring at the time of the malfunction leading to the stored code P023E. It is helpful to write down this information for the diagnosis process. Clear the codes and test-drive the vehicle to see if the code is reset.
If the code is reset:
If the sensors comply with the manufacturer’s specifications:
If reference voltage and a ground are found:
If the sensor signal circuit reflects the correct degree of voltage:
If all MAP/turbocharger/supercharger boost pressure sensors and circuits are within specifications, suspect PCM failure or a PCM programming error.
