We have a 2007 silverado with a battery drain. It does it about once a month. Had it back to dealer, they cannot find any problem. We replaced the battery-still same problem every month or so.
Has anyone had this problem? Is there a bulletin on this out there.

thanks
darrellkk

 

Try going to chiltonlibrary.com. They might have some bulletins for your vehicle. Have you checked to see if you have light that stays on somewhere. Sometimes the under hood light will stay on and cause a battery drain.