Does anyone know what these codes are for

Electrical problem detected on the circuit between the ECM and the Fuel Injector Control Module for (P1226) injector #2, and (P01229) injector #3. Verify ECM connector J2, pin numbers 65, 66, 52, and 72. Verify the large single point connector at the LH top of the engine Row B (second from the bottom) wire #1, light green/black and #2 red/black, Row C wire #1 black and wire #2 black/white. If the connections are OK, check for the harness rubbing on the black metal bracket that holds this connector to the engine. Also check the harness at the FICM to see if it is rubbing where the harneness is wire tied to the FICM.

I am actually telling you to confirm more injector circuits than may be necessary. The ECM tells the FICM to fire injector #2 on the J266 red/black wire, but the FICM takes that signal and fires the #7 injector...since I don't completely understand how the ECM diagnostics work for these codes, I provided all the circuits to verify.

Good Luck