I'm giving them until the end of the year, that's just over 3 months from purchase - I have engaged a lawyer who took my case and provided him all the sales, window sticker, phone records, GM case numbers and documentation stating "they don't have a fix" - that was key to the lack of "fix attempts". I'm in PA, I have 12 months/12,000 miles to kick off the process.
But agreed, I love the truck, I love the 3.0 Duramax to tow my small camper, but dammit, I need that trailer brake controller to work w/o the wires/aftermarket unit sitting on my center console. While that is working with my trailer brakes - the "Trailer Brake Disabled" error still pops on my dash info screen every time I start the truck as a cruel reminder of the money I paid for this feature that I am not getting as of yet...