First time I had "Charging system error" in January when -30C outside. The car didn't charge 12V batteries. I changed both batteries, but still got that next time when it was extreme cold. The car was taken to the dealer who just "programmed" new batteries. Couldn't find the fault in a warm garage. But after that I had it only once in cold day and the fault was cleared in my warm garage after I disconnect both 12V batteries to reset the car. But in the end of April the fault came back and didn't leave after reset. And temperature was above freezing point, so no cold problem either. It just that when the car in on, there's no charging to 12V batteries. Voltage stays around 12,5V when it should be over 14V. If turning on preconditioning via the app, I get "12V voltage too low warning" and no preconditioning. Also when this happens, the charging cable losing pin doesn't open to let a cable to be pushed in. So I can't charge the car. I took the car in the garage in the beginning of May, where they ran tests and told me that a BCCM needs to be changed. Price 6200€ + labour. Today I got the news that the BCCM has been change but 12V charging still not working. All electronics seems to be OK when they ran tests and cables also showed OK in tests. They have been contacted to the JRL factory, who tells that the factory never have this kind of case before, so no-one knows what to do next. Probably need to take the car the Finland main dealer garage, if those mechanics can find the fault. Any ideas? Many times forums know more that professionals 
