Does the eighth generation Sonata esp light on indicate a fault?

For the question you asked, the esp light should be caused by abs pump failure or throttle pollution, and another possibility is that the speed sensor failure or pollution leads to the sensor output error signal. There is also the problem of opening and closing the skylight, which may be the internal contact problem of the control switch or the grounding phenomenon of the related circuit. You can check from these aspects, I hope my answer will be helpful to you.