I've got a 2014 Chevy Malibu 2.5l that needs to be jump-started every time I use it. It doesn't have a problem if I drive more than 30 miles, but less than that, it needs a jump after I shut it off.

I have a new main battery(3mo), a new rear battery(6mo), and a new alternator (1mo). All my connections are clean and well seated. I have even tested the battery before trying to start it, without jump, and it is typically floating around 12.5 -13 V. Even with that, it won't start.

I sincerely hope someone might have some direction I could go in.

 

does the vehicle have a stop/start system?
if yes, did you put in an agm replacement battery?
any issues with the rear defroster shutting off or not working? The vehicle will disable the rear defroster if there are battery state of health problems.