Top U.S. automakers largely reported decreasing sales last month, with at least one company blaming an August 2016 that included one less weekend than the previous August.
Chevrolet — GM's largest brand — declined by less than 3 percent and its Cadillac luxury brand slightly increased, but GMC and Buick each fell by more than 12 percent.
Ford vehicles, meanwhile, fell by 9 percent, which more than made up for a 7 percent increase in its Lincoln luxury brand.
Fiat Chrysler, meanwhile, reported a 3 percent sales increase — the only automaker among the top six in the U.S. market to do so.
Jeep maintained a strong 2016 with 12 percent sales growth, while Dodge and Ram trucks also increased last month. The flagship Chrysler and Fiat brands fell by more than 20 percent.