We have a 2006 Kia Optima and the battery died on the weekend.
After replacing the battery the car works fine by the radio has a 'P5 ERR' one on it and won't respond to any buttons. There is no reset hole. We have the code for the radio but it doesn't show the screen to input the code. Google didn't help.
Any ideas?
Thanks
Contact Kia's PR Dept?