I received the same letter today. I need to go back into my email to see, but I believe they called this a "recall" in that update email I received last month.
What perplexes me about this is why not call it a recall? Doing the calculus in my head, It's a $30 part and takes maybe an hour or so of service to replace?
I feel as if most truck buyers who have this package will not tow, however these trucks will enter the secondary market where it's acquired by someone who might want to tow. I keep going back to this being a safety issue and the (my perceived) low-cost of repair, they should handle this in perpetuity if it's never been resolved by the original owner...
But that's just my $0.02 - I work in customer experience, this is just a horrible one and does not reflect well on the GM brand.
I am getting close to 33mpg on my 4x4 3.0 LM2 between Pittsburgh and Columbus when I need to commute, so I'm not looking to trade-in/switch just yet. Camping season just getting ready to start, I'm curious to the mpg and DEF consumption while towing this spring (just did 2 short tows last fall) - I imagine it still beating out the gasoline options in the long run form a value-perspective.