So, my mom has a Buick Enclave 2012. The service battery charging system code popped up. She got a new battery, and it seemed okay but then the message popped up again and then disappeared and then popped up again later. After test driving the battery saver came on so we went home. So when that didn’t fix it, we had my uncle try to come and see what’s wrong with it. He used his code reader and such and then we put in a new alternator. It seemed to have fixed the issue but this morning my mom had to go run some errands and then the service battery charging system code is back. Does anyone know what could possibly be the issue? Thanks in advance.