Kia Troubleshooting Questions? Ask a Mechanic
Hello, we do see a lot of radio issues with the 2012 Sorento. The issue you are describing sounds like the amplifier could be bad, however there is one thing that you should try before replacing any more parts. Remove all of the radio fuses, or remove the radio and unplug it totally from the vehicle. After it is unhooked or the fuses are out, play with the buttons on the radio for 15-30 seconds just to drain the capacitors inside the radio. Hook everything back up or reinstall the fuses and see if the audio works.