Hi everyone. I got this error plus some random alarming. The code is DTC CEM-B1D1787. It is probably the alarm siren battery. Here is a useful article on this forum:
https://www.volvoforums.org.uk/showt...siren+location
There is lots out there on removing the siren on older model Volvos, but little on this model. The article above implies that the siren is located under the cowl between the firewall and windscreen, but I would be very interested to hear more detail if any one has replaced or repaired it and how they did it.
Incidentally i bought a Vgate iCar Pro Bluetooth ELM327 adaptor (under £30) which when used with IOS Car Scanner Pro App (£6.99, I think) seemed to work very well.