BMS is the HV battery module, one of the 39 modules Ocean Live reads fault codes from with Faults→Scan all modules. The owner guide lists it as BMS (HV battery).
Readings come from the battery management module (BMS) with standard diagnostic requests. The app never uses security access. See the glossary for what they mean.
What the app can do
- Read its stored fault codes, and its software version and part number with Faults→Module versions→Read module versions (reading changes nothing).
- Clear codes for this module, only while parked safely. Share the report first: clearing erases the history a workshop would use.
- Ocean Live never offers Restart for this module, whatever state the car is in: it is one of the brakes, steering, airbags, drive, gateway or high-voltage battery modules. Clearing its codes is still possible.
Airbag (ACU), brake (ESP, IBOOSTER), steering (EPS) and high-voltage (BMS, PDU, PIU, MCU) faults should go to a qualified shop.
Confirmed codes that name it
U199702: Lost communication with HV coolant heater B (HV battery heater may not work)