DTC codes / P23xx · Ignition system and misfire / P23D6
P23D6 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the cylinder 2 fuel heater, which is used to warm the fuel for better cold-start performance and emissions. The PCM expects a specific voltage range when the heater is commanded on or off, and a reading above the expected threshold triggers this code.
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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