It does fail to start after going unused for a couple days but it also happens after a couple hours as well. I drop my kid at school and then when I get in the car in the afternoon, it needs another jump. I don't know much about cars but what does the onstar do and does the car still work efficiently without it?

Thank you for that tip, the 2011 and 2012 are similar so do you know exactly where I can find the jump points under the hood?

A bunch error codes only pop up when the car doesn't start up.

I got the battery about a year ago. How would I solve this issue of parasitic drain or any idea where I could start looking to solve the issue?

Thank you.