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DTC codes / P24xx · Auxiliary emission controls / P24BD
P24BD indicates that the engine control module has detected an open circuit in the control wire for the evaporative emission system's leak detection pump switching valve. The computer commands the valve to change state during a leak test but sees no current flow or voltage change on the control circuit, so it flags the circuit as open.
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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