ok I have a 2006 5.9 cummins with a h7s black maxx I am now getting a p0513 invalid immobilzer key code the truck was running fine all day and went to leave a store started it up and it started then shut off the programmer now says that it is not installed and when trying to reinstall programming it says that I have non alpha numeric numbers and will not reinstall please help I am dead in the water without my truck any help is greatly needed and thanks in advance

 

First off I would be calling the programmer manufacturer, second i would try to remove your programmer. Im not all sure what to do, unless for somereason your programmer locked up your ECM, but you can try to disconnect your batteries for 10-15 minutes and try again?

 

h&s fixed the problem for now have to wait for my appointment at the dealership now possible bad ecm