GriffinM

2023 GMC Sierra 1500 3.0L duramax LZ0 Bought this truck used at 75k km. Noticed vibration right away. Found a broken stud between the block and converter bracket on my own. GMC customer service told me that it was covered under powertrain warranty, so I brought it to the dealership. Paid $200 diag fee for them to tell me what I already knew and it's not covered under warranty. After further inspection it turns out the converter bracket is broken around the upper stud, and the lower stud is broke off in the block. Vibration between 1500-1700rpm and worse when going up hill or towing. Very annoying. I've read online that people have has this fixed under powertrain warranty, but GMC is saying they won't help.

I also had the issue with the broken stud, my converter bracket was also broken. Were you able to get this covered under warranty? Gmc is refusing to cover this for me.