Hyundai Sonata no key detected issue during warm months preventing starts on Hyundai Sonata

Some Hyundai Sonata owners report experiencing a "no key detected" issue during warm months that prevents their vehicles from starting. This problem may stem from a malfunction in the smart key holder system, which can lead to detection failures. For Sonata Hybrid owners, a "check hybrid system" message could also be related to the starting issue. Additionally, in certain models with the 2.4L or 2.0L Turbo engine, a loose starter M-Terminal nut may cause a no crank condition, particularly in colder temperatures. Some owners find that they are unable to turn the ignition key, indicating a potential mechanical issue with the key or ignition system. A temporary solution involving the removal of a yellow fuse from the fuse box may provide relief, but a long-term fix would require replacing the microswitch under the shifter. If these issues persist, it is recommended to consult a professional mechanic or contact Hyundai customer service for further assistance.