General Motors Co, Fiat Chrysler Automobiles and other major automakers reported weaker-than-expected US sales for March, hurt by declining demand for sedans and light dealer traffic during the Easter weekend.

Sales for the month rose 3 per cent to nearly 1.6 million vehicles, or 16.57 million vehicles on an annualised basis, according to industry analyst Autodata Corp.

That was well below expectations of a rise of about 7 per cent and annualised estimates that ranged from 17 million to 17.5 million by analysts and economists polled by Thomson Reuters.

WardsAuto, which issues data used in US government figures, showed an annualised rate of 16.46 million vehicles.

Shares of several automakers fell.

Mark Wakefield, head of AlixPartners' automotive practice, said light dealer traffic over the Easter weekend, which usually comes in April, hampered sales. But he said that 2016 sales would exceed the 2015 record of 17.4 million vehicles as relatively low interest rates, strong employment and low gasoline prices support demand for new vehicles, particularly SUVs and pickup trucks.

The shift away from sedans and toward SUVs and trucks is becoming more pronounced. Autodata showed that 56.9 per cent of March sales were SUVs and trucks versus 52.7 per cent a year ago. In March, car sales fell 6 per cent while SUV and truck sales rose 11.4 per cent.

IHS Automotive analyst Christopher Hopson said, "With ample incentives and inventory levels, the sales pace should quicken in the second quarter."

While Ford Motor Co's and Nissan Motor Co's results topped estimates, those of the remaining top automakers in the US market fell short of expectations.

Toyota Motor Corp said its sales fell 2.7 per cent to 219,842 vehicles. Analysts on average had expected about 239,000, or a rise of about 6 per cent, according to a Reuters poll.

Honda Motor Co's sales were up 9.4 per cent, against analysts' expectations of a 17 per cent rise.

Fiat Chrysler's sales rose 8 per cent to 213,187 vehicles, well below analysts' estimates of 220,000 to 229,700.

GM said its sales rose 0.9 per cent to 252,128 vehicles, about 2,600 fewer than cross-town rival Ford's and below the 3 per cent increase analysts expected.

Sales to consumers rose 6 per cent, GM said, as it pulled back on sales to rental agencies, which are not as lucrative. The company plans to cut sales for US rental car fleets by 80,000 to 90,000 vehicles this year.

Honda said its US sales rose 9.4 per cent, but analysts had expected a 17 per cent increase.

Ford said its March sales rose 8 per cent, narrowly topping analyst expectations. The average selling price of its vehicles increased by $1,600, said US sales chief Mark LaNeve.

Ford shares, nonetheless, along with GM's, were down about 3 per cent, and Fiat Chrysler was off 4 per cent. The broader Standard & Poor's 500 index .SPX was up 0.6 per cent.

Nissan reported a 13 per cent gain on the strength of its mainstay sedans, topping expectations of an 11 per cent rise.

In Canada, GM and Ford reported double-digit sales increases for March and the first three months of 2016. – Reuters