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Message: <blockquote data-quote="stutaeng" data-source="post: 26363" data-attributes="member: 6175">That's a circuit code, which means the ECU has detected something like an open or short on that circuit. So it could simply be a broken wire on the harness, poor ground or loose conenction.Find yourself a scanner that has bi-directional controls and along with a fuel pressure guage, do an "injector balance test." When I was just learning diagnostics, I spent like a whole summer chasing a lean, bank 2 code on my 00 K3500 beater. I was checking with a DVOM because that's all I had then, but all the sensors were checking out ok. I was like you and not wanting throwing parts at the thing. I finally decided to go buy a basic hand-held scanner that had live data and the injector balance test and after watching some YT diagnostics videos, I quickly ruled out vacuum leak. Another 15 minutes and the injector test revealed a dead injector #7. New spider fixed that. Could I have just bought a new spider? Yes, but that would have been a lucky guess...sometimes you get lucky, but often not.The injector balance test will likely reveal the injector with the fault, and that way you can narrow down where you look.You should have also a lean code (or misfire), if that injector is not firing, but I have learned on the SBC-based engines the ECUs don't always throw these codes.</blockquote>