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DTC codes / P23xx · Ignition system and misfire / P239B
P239B indicates that the powertrain control module (PCM) has detected an out-of-range current or a performance fault in the control circuit for the diesel intake air flow B control motor, which is typically the swirl control valve actuator or a second intake air flow control motor. The PCM monitors the motor's electrical current and expected movement, and it sets this code when the current draw is too high, too low, or the motor fails to respond as commanded.
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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