Code Definition

P023D — MAP turbocharger/ supercharger boost pressure sensor mismatch - Bank 1 - sensor 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P023D

P023D is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P023D is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P023D is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P023D fault code is set when the engine control module (ECM) detects a mismatch between the signal from the Manifold Absolute Pressure (MAP) sensor and the boost pressure sensor for Bank 1, Sensor 1 in a turbocharged or supercharged engine. This code indicates that the readings from the MAP sensor and the boost pressure sensor are not aligning as expected, which can occur due to a variety of reasons such as sensor malfunction, discrepancies in sensor readings due to mechanical issues, or wiring/electrical problems in the sensor circuits.

Quick Facts