Nothing is functioning wrong on the vehicle from what I can tell. The scanguages do not lightup or display any numbers. I have to unplug and replug the scanguage to make the display work.
After 1 second, the 12 V system (including underlying voltage supplies) will be supplied from the DC-DC converter and operating voltages will be maintained (despite U3012 being triggered). So, one would then expect everything to work now but it could be an indication of failures later.
Since you can duplicate the DTC and are likely still under warranty, I'd visit the dealer to at minimum get it on record.
Do you have Scangauges plugged into both OBDII connectors? And again, do you get the DTC with the scangauges unplugged upon startup? Unplug them, then start the car and plug in just one to see if the DTC returns. Are the guages plugged in all the time? If so, unplug them on shutdown.
Edited by plus 3 golfer, 26 August 2018 - 11:32 AM.