Haven't heard that one before, but good the dealer has repro'd it and is working on it. I wonder if the 12V battery is going bad and sucking down power to re-charge it upon car start (?)
In some perverse way going down in the history books as the first is neat! 8^pMy service advisor called me this afternoon, and told me the technicians are working with engineering to diagnose the problem. The techs have tested every cell in the battery, and surprisingly the battery is in perfect condition. He told me if any cell was bad then the whole battery would be replaced, but every cell tested normal (3.9). My issue has now been escalated to GM's 'Platform Engineering' department since apparently this has never been encountered before.