General Motors Co
GM said that sales fell to 156,673 vehicles in September, from 284,300 a year earlier when company incentives supported sales. The automaker expects to post a 21 percent market share, its highest of the year so far.
The results stood in contrast to Ford Motor Co
Rival Chrysler's U.S. sales fell 42 percent in September.
GM said retail sales fell 46 percent in September from a year earlier and fleet sales fell 43 percent.
GM left its prior fourth-quarter North American production forecast of 655,000 vehicles intact. That plan represents a 20 percent cut from the fourth quarter of 2008.
The automaker, which emerged from bankruptcy in July, said it ended September with about 424,000 vehicles in stock, down about 41 percent from a year earlier. The inventory included 157,000 cars and 267,000 trucks.
(Reporting by David Bailey and Kevin Krolicki, editing by Matthew Lewis)