DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P004F
P004F indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal on the boost control circuit for turbocharger or supercharger system B. This circuit typically controls a solenoid or actuator that regulates boost pressure, and the PCM sets the code when the electrical signal behaves unpredictably rather than failing completely.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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