DTC codes / P24xx · Auxiliary emission controls / P24BC
P24BC means the engine computer has seen the evaporative emissions (EVAP) leak detection pump pressure sensor signal drop out or jump erratically, but only intermittently rather than failing completely. The computer is flagging a non-constant electrical or signal fault in the sensor circuit that monitors the pressure the leak detection pump generates during an EVAP system self-test.
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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