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DTC codes / P24xx · Auxiliary emission controls / P24BB
P24BB means the engine computer has detected a voltage signal from the EVAP (evaporative emission) leak detection pump pressure sensor that is higher than the normal range for the current operating conditions. The sensor is supposed to report the pressure inside the fuel vapor system, and an abnormally high signal voltage tells the computer that the circuit is likely open, shorted to voltage, or the sensor itself has failed.
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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