I have exactly the same problem with my 2012 MKX. The car starts normally with no problem in a cold or cloudy weather. However, in a sunny and very hot weather, the car will never start until the weather gets cooler or after the sunset. I took the car to a dealer to diagnose the issue using a computer inspection. He did the inspection and the computer diagnoses two issues PCM and ignition switch. He said it could be one of them. He recommended me to start with replacing the PCM and if this did not solve the problem then jump to the second and replace the ignition switch. Did anyone have the same issue and after replacing the ignition switch everything went well?
