I have ran into this before when there was an aftermarket radio installed in a friends car, but i just acquired this car and can not connect to the ecu. the car still has factory radio, although i did notice an amp wire, and remote wire running to the trunk? The car starts and drives just fine, i have not tried connecting to any other module in the car threw obd2 (ive herd stories about burning up vagcom dongle / what ever else used) im going to check for voltage on k line this afternoon if there is no voltage present im going to try to connect to abs module or airbag. If i can connect to another module threw obd2 but just not the ecu what does this mean? the car starts runs and drives fine, but in order to pass nys inspection i need to be able to connect to the ecu! Any thoughts?
Thanks in advance!