Edmunds.com predicted new auto sales in the U.S. would rise a modest 1.6% in July from the prior year, as stronger sales from Detroit's Big Three and Nissan Motor Co. (NSANY, 7201.TO) should again offset declines from Japan's other top manufacturers.

But Chief Executive Jeremy Anwyl cautioned it was unclear how consumers would react to the uncertainty in Washington related to the U.S. government's debt-ceiling impasse. News of the bitter debate has dominated headlines for weeks, and with an Aug. 2 deadline looming, it could hurt auto sales for the final weekend of the month.

Japanese auto makers Toyota Motor Corp. (TM, 7203.TO) and Honda Motor Co. (HMC, 7201.TO) continue to be stung by inventory shortages in the wake of an earthquake and tsunami that struck Japan in March. Honda's sales are seen dropping 27%, while Toyota's decline is projected to be 21%.

But Toyota is expected to post a sequential increase, due to less serious inventory issues and a 25% increase in incentives from June, according to Jessica Caldwell, a senior Edmunds analyst.

Edmunds predicted Chrysler Group LLC will post a 15% increase in sales from year-earlier levels, which would make it the strongest performer in July. Larger rivals General Motors Co. (GM) and Ford Motor Co. (F) are expected to notch single-digit increases, while Nissan's sales are seen rising 12%.

July's sales are expected to result in a seasonally adjusted annualized rate of 12.3 million light vehicles, up from 11.4 million in June.

July had 27 selling days, one more than a year ago.

-By John Kell, Dow Jones Newswires; 212-416-2480; john.kell@dowjones.com

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