B2E2RUN

My 2014 Sierra has done this a few times, but never for that long, maybe 2-3 mins max. I never concerned myself with it.

Try this.. http://www-odi.nhtsa.dot.gov/owners/SearchResults?prodType=V&searchType=PROD&targetCategory=A&searchCriteria.model=SILVERADO&stats=1884945%2C11%2C0%2C72%2C17%2CSILVERADO&makeStats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jsonBaseURL=%2Fdownloads%2Ffolders%2F&searchCriteria.model_yr=2014&searchCriteria.make=CHEVROLET&searchCriteria.prod_ids=1884945

I think there is an old TSB for this. Check nhtsa.gov