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Driving at 60-70 mph and in hold mode, I experienced a slight loss of power, twice. Later I noticed the engine light lit. OnStar reported p0700 and p0756 errors. I took my 2013 to dealer and they said I would need to bring it back the following Monday for more extensive diagnostics and that they would give me a loaner then. The next morning I noticed the engine light was off (don't remember looking checking after leaving the dealer). Called OnStar and they could detect no codes now.

I suspect it's the solenoid, from the codes.
Can engine light be reset and codes turned off too, by the dealer.
I plan to test the hold mode tomorrow on the highway.
 
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