I had hoped to join the forum for fun stuff, but alas. I just bought a 2021 with 40k miles about a month ago. This week, I noticed "deep sleep mode" on the app but no other symptoms. I took it to Auto Zone. They told me the battery tested good but needed a charge. Took it to a local mechanic (at closing time on Friday) who quickly checked and said the alternator seemed to be charging and everything looked okay, but bring it back if something came up. Didn't drive it yesterday and it wouldn't start last night.
I'm a non-car knowledgeable girl but can follow simple instructions. Searching around there seem to be '21 F150s with known drain issues, and a service bulletin, but I'm not finding much on the Expys. Any ideas? Battery still bad on a 2 year old truck despite what Auto Zone says? (July 2021 build date)? Some accessory not turning off (can't see anything)? Some wire or relay not functioning properly?