I left my lights on last night and killed my battery. It’s a fairly new battery so I charged it and started right up. But now I’m getting the battery warning visit workshop message in red. I used DAS to clear all codes but it didn’t go away. I’m also getting a code for BCM not communicating. So where to look? Could I have killed the aux battery? I have the car 3 years and it came with the car. Do I need to replace the BCM?

 

Disconnect the battery for a bit and then check it again. It's funny how a hard reset fix's some glitches.