Code Definition

P0242 — Turbocharger Boost Sensor B Circuit High

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

About P0242

P0242 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 P0242 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 P0242 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 P0242 fault code is set when the Engine Control Module (ECM) detects a higher than expected input signal from the Turbocharger Boost Sensor B. This sensor, typically a secondary sensor or one located in a different area or on a different turbocharger in systems with multiple turbochargers, is responsible for measuring the pressure or boost produced by the turbocharger. A high input signal might indicate an electrical issue in the sensor circuit, such as a short to power, a malfunctioning sensor, or problems with the wiring or connectors. Such a condition can lead to incorrect boost pressur...

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