You need to have your gmc computer checked for codes ,since the light is now off,they will have to check history codes for what caused it
I have had this issue occur on mine as well. It has nothing to do with the AWD. From what the dealer told me the warning lights will come on and the engine will actually shut off if it "detects" bad fuel that could harm it. Perhaps you got water in your tank or just some low grade fuel?????? I know it does not quite make sense. This has happened to me twice in 3 years of driving this vehicle.
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