I keep getting these codes injector positive Voltage control circuit group 1 and 7 and I see a lot of post about them for the lly. What are the ways of testing from the FICM to the harness under the valve cover. Most of the time I can just shut the truck off and start it back up and the codes are gone. I replaced the injectors 40k miles ago. Its a 2003 lb7 eclb ,efi live, 50hp injectors.
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