General Motors says its U.S. sales fell 1.2 percent last month as rising truck and SUV sales couldn't offset falling car sales.
Three of GM's four brands reported declines for the month. GMC, which sells only trucks and SUVs, reported a 10 percent increase.
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The company said it sold 272,423 vehicles last month.
Still, GM predicted a strong finish for the year. The company now expects total U.S. sales to be near the high end of its forecast range of 16 million to 16.5 million.
GM's sales have held up despite a series of safety recalls. The company has recalled 29 million vehicles for numerous problems.
Industry analysts are predicting flat overall sales in August compared with a year ago. But Chrysler and Nissan bucked the trend with double-digit increases.