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DTC codes / P24xx · Auxiliary emission controls / P24B9

P24B9EVAP System Leak Detection Pump Pressure Sensor Circuit Range or Performance

P24B9 means the engine computer has detected that the pressure sensor inside the evaporative emission (EVAP) leak detection pump is reporting a voltage or pressure value outside its expected range or behaving erratically. The computer compares this sensor signal against known-good limits and sets the code when the reading is implausible for the current operating conditions.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
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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