Code Definition

P0249 — Turbocharger Wastegate Solenoid B Low

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

About P0249

P0249 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 P0249 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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 P0249 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 P0249 fault code is set when the Engine Control Module (ECM) detects a lower than expected input signal or voltage in the Turbocharger Wastegate Solenoid B circuit. This solenoid is part of the turbocharger system, typically in vehicles with multiple turbochargers or a twin-turbo setup, and is responsible for controlling the wastegate valve that regulates the boost pressure produced by the turbocharger. A low input signal could indicate an electrical problem, such as a short to ground in the solenoid circuit, a malfunctioning solenoid, or issues with the wiring or connectors. This can resu...

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