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Engine light flashing and goes away after

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I have a 2020 silverado z71 with 62,000 miles and when I drive on the hwy I'm going 80 with cruise control on, I noticed the engine light flashing. It would flash for a little bit, Cruise control still on, and then it would stop and go away completely. When it happens the truck feels and drives the same, No engine struggle or noise. It drives the same before, during and after the flashing light. It also has happen with the cruise control off.

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Possible misfire, possible rear O2 sensor.  Only way to know is to pull the codes, so go to a local auto parts store and they will pull the code for free.

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