It was the ECM, I hadn't done any welding but the alternator did go out 2-3 weeks ago. Not sure if that caused it. But that's what it needed...
know what these codes represent 74,73,72 are injector codes I believe
I've got a 2000 Freightliner with a 3126 CAT engine. I basically drove it home and it will not start now. ran the codes they are 74, 73, 72, 15,...