Zimmermann Danton

I haven’t figured it out yet. Some other odd things it does. When off, the fan in the dash will blow for about a minute intermittently. I also see the stereo screen and DIC screen light up. And the transmission control module has a high pitch noise coming from it. All when vehicle is off and locked.

Hi all. I have a 2016 Yukon Denali I just purchased recently with 71k miles for just about 2 weeks now. Test drive was great and vehicle drives great. 3-4 days after purchasing vehicle the battery was dead after sitting all day. Gave it a good slow charge thinking maybe the battery was low after sitting on the lot. Ran great for a couple of days and then dead battery again. Battery is new and tests good. Been having a major battery drain issue. Any suggestions or experience with this issue? Responses would be greatly appreciated!