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DTC codes / P24xx · Auxiliary emission controls / P2438

P2438Secondary Air Injection System Air Flow/Pressure Sensor Circuit High (Bank 2)

P2438 means the powertrain control module (PCM) has detected an abnormally high voltage signal from the secondary air injection (SAI) system's air flow/pressure sensor on bank 2. The PCM expects the sensor's output to stay within a calibrated range, and a high signal indicates either excessive pressure/flow in the SAI passages or a fault in the sensor's circuit.

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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