What is a "PI"? My truck is doing this and am taking it in again on Monday. It is intermittent and never does it while at the dealer so they tell me they cannot recreate it. I figure I will take it in every week until they get sick of me!
From the GM Upfitters Web page:
AM Trailer Brake Harness
UPDATE:
An After-Market Trailer Brake Controller Jumper harness for the New 2014 1500 series pick-up trucks is now available. This ready to use harness (P/N 23184088) can be obtained at your area GM Parts Department. If you need more information please let us know via our Contact Us page.