Hello Volvo friends, I turn to the swarm intelligence, as my Volvo car dealership cannot explain the following: I have my XC60-D4 (model year 2012) now almost 7 years 130,000 km, was planned from the beginning as a 10-year car. So far hardly any problems – except that the rear brakes always have to be renewed after 40,000. Since 2020 the car has an underground car blues. This is expressed by the fact that it is now 3 times in different underground garages to a complete union the communication came on the high-speed bus. 2 times the car didn’t start, but a whole cascade of error messages was displayed. 1x the malfunctions occurred while driving slowly in the underground garage. Helped: car off, 10 minutes wait, then everything went again. Once for 2 days the fault indicator at the top left “abgases”, but then also went out again. The Volvo workshop listened to my descriptions first unbelievingly, the assembler said after boarding and nd Driving: it’s a great shot. But the reading of the error memory then resulted in some communication problems of all possible ECUs, invalid data of ECUs, then at the end several times “DEM-U000188 bus”. However, an origin could not be recognized, since the selection list unfortunately shows no date clock time. As mentioned above: so far only in underground garages. My first suspicion goes towards reflection of signals -EMS (electromagnetic disturbance), since the environment i n underground parking is pure reinforced concrete. Maybe it is also something completely different? The workshop certainly has no explanation – “we have never had before”. Maybe someone knows it … In advance thank you for your contributions erde9