DTC codes / P23xx · Ignition system and misfire / P2398
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.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.