If they're doing this without any testing to back it up, I hope GM goes after them for legal expenses. (Yes, lawsuits can sometimes blow up in people's faces.)I'm thinking they're just upset with their purchase because it's been having problems and are using this to try and get GM to buy them back.
And that's all assuming they even have any facts to back up their claims. I highly doubt they do.The firm representing these nine people, Hagens Berman, is the same firm that sued VW. I smell a rat, er, lawyer, looking to make a quick buck. I wouldn't be surprised if at least one of those nine has had someone remove part or all of the emissions system. As part of this suit, GM needs to demand the court allow GM's engineers, along with a court appointed engineering team using GM's design, build, and repair documentation for the CDT to review each of those nine cars. If any of them have been modified in any way that would impact the power train and/or fuel combustion then that owner's claim needs to be tossed out and their entire warranty voided as payment of damages to GM. Basically, the car in question needs to be flagged as a salvage title.