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DTC codes / P24xx · Auxiliary emission controls / P2431
P2431 means the powertrain control module (PCM) has detected that the secondary air injection (SAI) system's air flow or pressure sensor circuit is reporting a value outside the expected range for the current operating conditions. The PCM monitors the sensor's signal during the SAI pump's active test and flags the code when the voltage or calculated pressure does not match the commanded air flow within a calibrated time window.
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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