Code Definition

P0235 — Turbocharger Boost Sensor A Circuit Malfunction

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

About P0235

P0235 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 P0235 is stored, the module has detected 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 P0235 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 P0235 fault code is set when the Engine Control Module (ECM) detects a malfunction in the circuit of the Turbocharger Boost Sensor A. This sensor, often referred to as the boost pressure sensor, measures the amount of boost or pressure generated by the turbocharger and sends this information to the ECM. The ECM uses this data to make adjustments to the engine's fuel delivery and ignition timing to optimise performance and efficiency. A malfunction in this sensor's circuit can lead to inaccurate boost pressure readings, which may cause the engine to underperform, exhibit poor acceleration, ...

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