Code Definition

P0240 — Turbocharger Boost Sensor B Circuit Range/Performance

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

About P0240

P0240 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 P0240 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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 P0240 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 P0240 fault code is set when the Engine Control Module (ECM) detects that the range or performance of the Turbocharger Boost Sensor B is outside the expected parameters. This sensor, often a secondary sensor or one located in a different area or on a different turbocharger (in twin-turbo systems), measures the pressure or boost generated by the turbocharger. The ECM relies on this data to make adjustments for optimal engine performance, including fuel delivery and ignition timing. Deviations in the sensor's range or performance can result in improper engine operation, potentially causing i...

Join TaT to view the complete code information and diagnostic details.

Quick Facts