EPS light turned on and power steering stopped working

Hello, sorry to hear of your issue, the electronic power steering has a few different components that need to be checked. There's the electric motor, the wiring harness, sensors, and a module (computer) that controls and reads inputs. You can do a visual inspection for any lose connections. Besides that, it will require testing for certain voltage signals and proper grounds. As soon as the system sees any fault it shuts down and sets the light for safety purposes. It's not a system you want to fail at 70 mph down the highway. So if you're unsure about testing then I would recommend taking it to a qualified technician.

If you had a charging system problem there would be other things happening as well, you can check it just put a multi meter on the battery, should read 13.6 to 14.2 somewhere in that range. The module that controls the EPS will have wire(s) that power it up and ground wires as well, do you have a scan tool that you can see live data on?

9 times out of 10 it will be the steering motor.