2005 hd, 6.0 all stock. 240k miles! The light comes on about three-four days a week, only in about the first 10 miles or so. I have a scan gauge on all the time and see no problems. I can get the light off if I clear dtc while flashing. No drop in power, runs good... Any tips?

 

Sounds like misfire to me. Recommend checking spark plug wires for connection, cracks, etc. and plugs for eroded tips, fouling, etc. before looking at coils, etc.