Did you have the b1516 code before working on the car? If not, you've more than likely turned the battery current sensor around the opposite way when installing it.
See the following for troubleshooting information: https://www.brakepartsinc.com/dam/jcr:dd879eb0-b5a0-4eb3-862b-2cb49f40e18d/13) Technical Service Bulletin - November 2017.pdf