Code Definition

P0238 — Turbocharger Boost Sensor A Circuit High

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

About P0238

P0238 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 P0238 is stored, the module has detected a signal or supply voltage higher than the expected operating range; 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 P0238 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 P0238 fault code is set when the Engine Control Module (ECM) detects a higher than expected input signal from the Turbocharger Boost Sensor A. This sensor, also known as the boost pressure sensor, is responsible for measuring the amount of pressure or boost generated by the turbocharger and conveying this data to the ECM. A high input signal from the sensor may suggest an electrical issue in the sensor circuit, such as a short to power, a malfunctioning sensor, or problems with the wiring or connectors. This condition can result in incorrect boost pressure readings, which may cause engine ...

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