Had it in for dead battery, battery 6-months old. They check alternator, ran parasitic test and "all good" - and put in a new battery. When I asked about battery codes / module updates, etc. got "no real answer, other than "bring it back it back" if new battery develops low voltage.
THANK YOU... not saying this is the answer but have gremlins in Sync and electrical (third battery since new). Just got back from dealer with basically "no issues" found