Despite the strong September sales, industry executives remain somewhat cautious about the months ahead.
September sales were $63 million lower than in August, when they had risen 3.4 percent from the month before.
September sales were up 9.5 percent from the same month a year ago.
Other big auto makers report September sales later this week.
Some economic indicators - September retail sales, for example - have not been encouraging.
Early September sales of cars and light trucks fell 9 percent from the year-ago period.
Honda's September sales rose 9.7 percent from the period a year earlier.
Other auto makers also reported strong September sales today.
Originally September sales were reported as a 1 percent gain.
September sales were up 77.1 percent from August, the largest month-to-month increase in two decades.