Battery light was coming on intermittently. Took the alternator out to have it tested and it was bad. Replaced it and while doing so charged the battery (outside of the vehicle). Got everything put back together and started the vehicle, and then got a check engine light. Code came out as U110C. Rechecked all connections from the alternator repair and everything looked good. Disconnected the battery and started it again, 20 seconds later, I got the check engine light again and same code of U110C.
Any advice on what is causing this and how to fix it?