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P1506 on a Kia indicates that the engine control module (ECM) has detected an abnormally high voltage on the opening coil circuit of the idle air control (IAC) valve. The ECM expects the coil to draw current and produce a voltage drop when commanded; a high voltage reading means the circuit is open, has excessive resistance, or the coil itself is faulty.
Guidance is general and written for Kia vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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