Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
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It's not a ground problem, or a fuse. The keylock solenoid is most likely sticking. When there is no power, (battery disconnected) it will release. It works when it has power and the vehicle is not in park or the controller thinks that it's not in park.
Of course it could be in the trans range position sensor, which can also be checked, thanks