FICM uses 2 separate circuits (banks) to fire the injectors.
If the wiring for any of the 4 injectors is compromised, all those cylinders will shut down and set code 2146--- or 2149.
Bank 1 => 1,4,6,7
Bank 2 => 2,3,5,8
It is NOT the injector-! GM has a repair connector-- also some part stores.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry