DTC codes / P23xx · Ignition system and misfire / P23DA
P23DA indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the fuel heater built into cylinder 3's fuel injector. The PCM expects the circuit to pull the voltage low when the heater is commanded on, but it sees the line stuck near battery voltage, which points to an open circuit, a failed heater element, or a wiring fault rather than a problem with the injector's fuel delivery.
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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