Hello community, have already read many amounts about PDC problems, but I didn’t really get smart about it. I hope you can help me, or that we can come to a solution together. With me, the PDC on my BMW 630 Bj 2007 sporadically goes on and off. Quite often it is that when I start the car everything works wonderful and while driving, although PDC should not work at all, comes the error message that PDC has failed. Partially the parking system works I turn off the car and the next day it usually works again immediately. However, the problem is not fixed with every start of the engine. Sometimes it also happens that when I start the engine immediately the error message comes with the PDC, but e.g. when driving backwards immediately is gone. I had the error memory read out, then the message came: “9E3B ultrasonic sensor supply” If PDC is equipped with The monitor still shows the car and the PDC LED flashes on the button. I measured, but the PDC control unit gets voltage even if the system does not work. The sensors would have to be all in order, because everyone shows without problems what and otherwise also in the error memory what should be. My guess lies with the PDC control unit or probably on the supply line to the sensors (hi or vo), that there may be a cable break. But I am not Is it possible to measure the cables to the sensors individually without removing the bumpers so as to at least limit the error? Does anyone already have experience with defective ECUs, how the PDC system behaves then? Would be very grateful for any information.