DTC codes / P24xx · Auxiliary emission controls / P24B1
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.
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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