I have had the same intermittent problem for about a year and a half and I can't seem to nail down what's causing it: VAG-Com will not communicate with any control module, and when entering Options\Test Connection, I get Status: Questionable; K1: Short to Ground; K2: OK.
I have only seen this on my car and have used the same cable and port on a dozen different cars, so I know it's the car.
- Radio is stock, no aftermarket electronics.
- Transmission wiring harness was cut behind the firewall when I did the manual swap, removed the TCM.
- While having the issue, disconnected ECU, cluster, radio, HVAC control head, ABS pump, didn't fix anything.
- Inspected the OBD connector, looks fine to me.
So, I'm at a loss. There are probably lots of modules on that communication bus, but I removed all the ones I could think of hoping one of them was causing the issue. Any thoughts on this would be most appreciated.