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The words "check brake fluid level" came on this morning. Also, two icons came on. The "Brake" and "Traction" lights came on. Then, my OnStar sent me a message to get my Vette in for service.
Have heard a lot of rebooting going on for some cars with the dash going dark while driving. Does it still happen after you turn the car off and back on? If it doesn't, the reboot since these are as much computer as they are car is the probable explanation.
Happened to mine in late 2015, interior lights worked no dash lighting and wouldn't start or (crank)
did the remove battery cables.....no problem since.