The official notice
Defect
On certain plug-In hybrid electric vehicles (PHEV), debris may have entered the high-voltage battery during production. As a result, the battery could short circuit.
Safety Risk
A short circuit in the battery could create a fire risk.
Remedy
BMW will notify owners by mail and inform you to take your vehicle to a dealer to test the high-voltage battery. The cell module(s) will be replaced, if necessary. BMW recommends that you should not charge your vehicle and that you should not drive the vehicle in manual mode, sport mode or use the shift paddles until the recall repairs have been completed. BMW also recommends that you should drain the high-voltage battery via iDrive, by setting/leaving the charging state at 30%, until the recall repairs have been completed.