[MilzyZ34]

Could be right about voltage on the serial data line. I don't test that wire for voltage, just continuity, resistance, and short to ground. With the output on that wire being a stream of data from the pcm, I just don't think measuring the voltage is the best way to test that.

I think it's pretty hilarious that the dealership is clueless when they are the most expensive option, and also the option people assume would be the ultimate solution to their problem.