I have an 04 1500 Hemi and discovered something by accident. Just curious what is it. I was holding in my trip odometer reset button while turning the key to the on position when everything on the instrument panel lights up. At the same time the speedometer moves like a clock from 0 to 120 pausing at every 10 miles per hour then it goes back to 0. At first I didn't realize how I did it. But then I tried it again and was curious what it is? It appears to show codes if any afterwards. I should have taken a small video or pictures. If you are curious go out and try it right now. Does anyone know exactly what this is? I haven't seen it mentioned and I read lots of 3G Ram threads here.