If one injector is not firing you lose 25% of your power.
Each injector gets its signal from the PCM (computer). The injector needs constant battery power & the PCM pulses the ground to the injector to control the open time called the pulse width. If it is not getting power or ground signal it won’t fire. Without researching the code you are getting I’m not sure what is happening but a guess would be that the PCM might be sending the ground &/or power signal but the injector is not getting that signal & not opening. That would possibly mean an open in one or both wires to that injector or a bad connection at either the injector or the ground wire at the PCM (all injectors use a common circuit for power supply, splicing off to each one). So start by carefully checking the wiring to that injector.
There is a lot of info in the FSM. Use the link below, if your yr isn’t there pick the closest one, the injector info is the same from yr to yr.
See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.