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DTC codes / P24xx · Auxiliary emission controls / P24D8

P24D8EVAP System Pressure Sensor or Switch B Circuit High

P24D8 indicates that the powertrain control module detected an abnormally high voltage on the circuit for the EVAP system pressure sensor or switch B, which is used to monitor fuel vapor pressure in the evaporative emissions system. The high voltage reading typically means the sensor signal wire is shorted to voltage, the sensor has failed, or the ground circuit is open.

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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