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DTC codes / P24xx · Auxiliary emission controls / P24D9

P24D9EVAP System Pressure Sensor or Switch B Circuit Intermittent

P24D9 indicates that the powertrain control module has detected an intermittent fault in the electrical circuit for the evaporative emission system's pressure sensor or switch B. The computer sees the signal from that sensor drop out or become erratic for brief periods, rather than failing completely, which is why the code is stored as intermittent.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

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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