Endangered GM brands: The risks, rewards of buying Chicago Tribune, United States The Saturn, Saab and Hummer are expected to be sold off, while Pontiac is being shut down entirely. GM plans to move forward with four core brands -- Buick, Cadillac, Chevrolet and GMC. Even though the federal government is guaranteeing the warranties ... Backgrounder: General Motors Corporation GM Bankruptcy: What it Means to You A Reader Q.&A. on GM's Bankruptcy |