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DTC codes / P23xx · Ignition system and misfire / P2398

P2398Diesel Intake Air Flow B Position Sensor Circuit Low

P2398 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the signal circuit of the diesel intake air flow position sensor B. This sensor, often part of a dual-bank or twin-turbo intake system, reports the position of a intake air flow control valve or flap; a low signal means the PCM cannot trust the sensor's reading, which may affect fuel delivery and emissions control.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

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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