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DTC codes / P24xx · Auxiliary emission controls / P24B1

P24B1Particulate Matter Sensor Circuit High

P24B1 indicates that the powertrain control module has detected an abnormally high voltage on the particulate matter sensor circuit, which typically points to an open circuit, a short to voltage, or a failed sensor. The computer expects the sensor signal to stay within a calibrated range, and a high reading means the circuit is not returning the expected feedback.

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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