My 2004 2500 Hemi ETC light comes on in extreme cold temps, I’m talking -10 or colder . Only does it in these temperatures. Anyone have this problem? If I shut the truck off and restart it goes away. Should I be worried no codes or other lights on.

 

So long as things work the way they are supposed to on restart, don't worry about it. Probably just a sensor misbehaving a bit when its bitter cold. I don't like being outside when its that cold either.