[JulianDS]

I had this. stayed on For about a week. VW assist says ‘known software bug, book into main dealer for upgrade and in the meantime just carry on’’
was With dealer last week, no upgrade but they ‘bled the coolant’ in accordance with VW advice.
all sounds a bit hocus pocus to me although car seems ok for now.
my amateur googling suggested coolant issue which ties with what they both said i I think (2.4 alters battery heating)