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DTC codes / P23xx · Ignition system and misfire / P239C
P239C is a generic powertrain code indicating that the engine control module has detected an abnormally high air flow condition in the diesel intake air flow 'B' control system, which typically refers to the secondary or bank-specific air metering circuit. The computer compares the commanded air flow against the actual measured air flow from the mass air flow (MAF) or manifold absolute pressure (MAP) sensor and sets this code when the measured value exceeds the expected threshold for a calibrated time.
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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