LPG injector resistance is approx. 1ohm.

If good.

Check inline fuse and connector.

Check ECM connector and pins.

Check wiring is not grounded to injector housing.

Check continuity between terminal 1 at LPG injector to terminal 119 on ECM.

Check continuity between terminal 2 at LPG injector to terminal 120 at ECM.

If good air clean connectors and apply contact revival agent.

Clear codes.

If code comes back swap ECM with known good part.