2014 GMC Acadia, Stalls Sometimes, Codes P0689 and P1682

This 2014 GMC Enclave came in with the complaint that the engine would fail to start sometimes and occasionally stall while driving. Multiple warning lights would come on in the dash. I checked codes and found codes P0689 and P1682 stored in the PCM. In researching the codes I found a GM TSB #19-NA-276

I had also found references to loose connecting bolts at the underhood fuse box that hold the harness connectors to the bottom of the fuse box. I checked and the were fully engaged even though the click while rotating was disconcerting.

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