dij16
28th October, 2019, 11:51 PM
Hi all, on A6 4F i have problem with ECU EDC16CP34 communication, intermittent. Ecu p/n is 4F0907401 C. When you put key into ignition ESP fault, trans fault and so on, VCDS cannot see ecu, just say "Cannot be reached". After some time or few ignition cycles, everything is ok, car starts and ran normally, ECU communicate with car and diagnostic. I have replaced ECU firstly, not same number just eeprom swaped, but problem still there. What can cause this problem? I didnt checked anything else. On G5 EDC16U1 i have these problem many times, every time problem was a bad ECU.