Service Engine Light On problems of the 2011 Chevrolet Traverse

My Traverse started at the beginning of winter randomly having the engine light come on then the vehicle would ding and I would get a message of "service traction control" then "service stabilitrack" and then it would ding again and I would get the message "reduced engine power" after a couple months this happened every time I started the car and was finally able to take it in to have the code read. Turns out the throttle body was shot. Gm replaced this under an extended warranty. Well upon picking my vechel up I was told the rear O2 sensor was shot, they wanted to charge me $250 to replace it, I opted out and my husband, an on the side mechanic, fixed it for a total of $30. Service light still on after new O2 sensor. My vehicle was also making a weird sound at this time which I described to my husband as a grinding. They hooked it up to the computer again and said that they gave me the wrong info last time that it was the front O2 sensor that was bad but that was the only code. So I ordered another O2 sensor for my husband to fix. . . 2 days later my service engine light started flashing at me. I immediately pulled over and shut my vehicle off. I called the local dealership to again ask if another code was thrown, was told no. . . Drove my vehicle home and my husband drove it. He knew it was the timing chain. He called the local dealership once more and they quoted us at $2500 to replace as the entire motor has to come out. He called to a different dealership 40 miles away and it was $1900 to fix. I got on the phone with gm and wanted to know if there was any recalls as this is a very common problem and at this time there are not so they didn't cover any of the cost!!! I have a cousin who also has a 2011 Traverse and it is currently sitting at the shop with the exact same problem, however hers also needs the catalytic converter replaced!!.