turned on my chip one day and it shows a graph when u start it and a red line runs across. Never seen it before. Doesn't vary much. I bought the truck with chip in it. 08 6.7L dodge cummins. Any help would be appreciated Tryed to fiddle around with it wont come off. I must be missing something really sImple

 

Maybe try and unplug it while the truck is off at the main plug under the dash around about your brake is were it should be located so try and unplug that while the trucks off and then wait 10 seconds then plug it back in and start it and see if its still red lining.