I just bought a 2017 Volvo S90, 72kmiles. Driving two days ago, had three DTC's pop-up "Transmission service required, TPMS system fault and, Parking brake unavailable". I have seen warnings like this stemming from a weak battery. It seems really unusual to have three faults pop up at once.
Paid $400+ to have a new battery installed, codes cleared, all good.
Today driving to YMCA, three damn codes pop up again. Could it be the aux battery failing? Checked stationary voltage at 12,6VDC of aux battery.
Anybody else seen this