Replaced my torque converter under warranty at about 45k miles after numerous visits to the dealer for suttering. It finally just stuck in 3rd gear. Ended up being a combination of 4 instances of main wire harness chafing and the Torque converter. I had lost all confidence in the truck and it was my work truck to tow my trailers. Now at just under 70k, the replaced torque converter and the repaired wire harness its been rock solid. Here in Florida (flat and straight) I get 15mpg all day long pulling a 22ft pontoon work boat with 1500 of extra gear on it. When I Pull my 20' aluma flat bed with 1000lb gear I'm getting 26mpg. These mpg make me a happy camper with my 2016 CC LT 2x4 LB 2.8 with a smart cap.Read all the post on diesel shudder problem, I have the same problem. Had trans computer updated, trans oil and filter changed, $500 later, no help. Has anyone received help from GM yet?
Correction: 2.8L DieselMy 2017 GMC Canyon 2.7 Diesel started shuddering at about 35,000 miles. The dealer made a superficial diagnostic test, determined it was a faulty solenoid and made the repair. The problem resurfaced at 62,000 miles. This time, upon closer inspection, the dealer discovered I needed a new transmission at a cost of $6,400. Note that the shuddering can lead to transmission failure, especially if you're towing. If you have a shuddering problem, have the dealer drop the pan and perform a complete transmission diagnostic.
I filed a suit against GMC and have just closed negotiations with them. They will replace my transmission and give me a 36 month/100,000 mile warranty on the new one. They will also pay more than $10,000 in attorney's fees. It was as clear to GMC as it was to me that the shuddering problem led to the transmission failure, yet I could not get GMC to budge and replace the transmission at their cost. In such cases, I find an attorney that specializes in auto warranty issues. If you've got a good case, they'll accept it and they'll represent you at no cost. It's wasteful to go that route, but that's the only equalizer against the giant.