MySilverado180

I also had similar issues and even had the dealer look at it. Everything was working correctly according to GM. Also noticed the loose fitting plug. Seemed too loose to maintain electrical connections. So I looked inside the receptacle and if you look closely you can see what looks like a quarter round piece of trim between the base and the wall. I figured my plug was going just above this, keeping it loose. Next time I towed, I had to push really hard to get the plug to seat inside that quarter round. It did! The plug was now tight, and never had the problem again. If you do this, just make sure the plug is aligned with the pins correctly and should be 95% of the way in, still loose fitting. That last 1/8 of inch is the push really hard part. good luck.

I have had this issue on multiple occasions towing an RV. The 7 way connector is a very loose fitting, and when it loses connection, I get this error message on the DIC. Always have to re-seat connector and turn vehicle completely off to get it to reset. Tried electrical tape to make it a tighter fitting. Worked better, but not great. Found that I had to tap the 7 way in further by a little less than 1/2 inch. It then grabbed properly and no more issues. Very tight fit when I did that, was almost afraid of breaking something. Thanks for the TSB link above. I will also try getting the Pollak connector.

Maybe my story will help. I have the 5.3 with 8 speed and I have a lifetime mpg of 18, and this includes some towing. I average 19-20 on my daily drive to work (mostly highway). It does go down some with the cold. I use Oil Life Monitor (OLM) to know when to change my oil. Get it done just above 0%. I track my mpg very closely and started noticing the mpg would go way down towards the end of my oil life. This was only when I was using up the free oil changes the dealer gave me. I have since switched to doing oil changes myself, and I use Mobile 1 fully synthetic 0W-20. What a difference in mpg. There's no longer a dropoff in mpg toward the end of my oil life. Can't explain it, just my observation.

Interested as well. Any details about this? Is it a TSB or full recall? Production date range?