amigakid

Seems to be a problem intermittently with the door sensor working some of the time, but I also notice the Fuel pump won't prine. I get the code for no communication to ECM, but have replaced it and still no priming. Does the Fuel pump have to prime first, or should it still start without priming? This no start thing was happening on and off without actual consitent reason, now there is no starting at all. All the plugs and ignition coils have been replaced. This is a 2008 Audi A4 Cabriolet with a 2.0t engine