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No 1st gear? 2015 Tahoe LTZ: I went to back out of the garage today and heard a loud clunk when I put it into reverse. Engine light came on and lost acceleration power. We hooked up the code reader to it and got the codes P2721, P0971, and P0700. We tried to erase them and they come right...

Does anyone else have the problem where the screen will go blank. About a minute later it come back on. This happens at random times while driving. Thank you.