P1608 on a Kia indicates that the powertrain control module (PCM) has detected an internal malfunction, typically a failure within its own processing or memory circuits. The PCM runs self-tests and sets this code when it cannot reliably execute its control strategies, which may affect engine management and other systems.
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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