rmw04c

I had a very similar problem with my 2015 Sierra Denali. Did you have the permaplate by chance? That seems to be what did it to mine. Made it extremely brittle and faded quickly. GM did absolutely nothing for me, so I got rid of it.

I have had these issues...basically everything in this entire thread. I have a 2015 Denali, and at 17,000mi the dealership replaced the transmission. It is even WORSE after this has happened. I issued the final repair notice to GM after having the truck in the shop 9 times in the first year - they told me to pound sand on the final repair attempt and denied the issue even exists. I get shudders, hard shifts, lurching at low speeds, LOUD clunking...the works. It is insane - criminal - that they are allowing this to happen to people with these 8spd transmissions. Their customer service is HORRENDOUS, and has put me into the system and has circulated me for months without doing anything. They offered an extended warranty - but what's the point if I have to come in to the dealership 10+ times a year? The truck not only causes serious safety concerns, but costs me hundreds of dollars by having to go to the dealer (50 mi away) for service. This truck is a complete sham. I am shocked that an American company would screw over so many Americans. I know we're not the only ones - just the only ones on the forums talking about it. Has anyone else had any luck in resolving the issues permanently? Whether through a new 2016/2017 that doesn't have the issues, or ANYTHING that fixes this? I feel like I'm going insane here.