Are you getting instructions on the screen?
If I remember correctly, after I plugged mine in, it told me to turn the key off and then told me to turn it back on. I have plugged and unplugged mine several times and I think I've gotten that message. When I do I just unplug OBDII plug and plug it back in. That seems to work. Also, I've turned the switch off and back on.
Al
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