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DTC codes / P24xx · Auxiliary emission controls / P24B4
P24B4 indicates that the engine control module has detected an out-of-range or performance fault in the electrical circuit that powers the particulate matter sensor's heater. The heater is responsible for bringing the sensor up to operating temperature so it can accurately measure soot levels in the exhaust, and when its control circuit behaves abnormally, the module stores this code and illuminates the warning light.
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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