I have a 2013 Sierra 2500HD, 6.0 gas. Normally when I turn off the engine and open driver's door the radio turns off. Now it stays on and I have to turn it on and off manually. There must be other t...
That switch also turns off the interior lights if it's in the door open mode. Are you sure that maybe you may have adjusted the turn off time. I know on mine, the radio off, interior lights off can be adjusted from 0 to about 2 minutes.