DETROIT – September was a blockbuster sales month for the U.S. auto industry – except at Volkswagen, where an emissions scandal forced the company to halt sales of most of its diesel-powered vehicles.

Strong consumer demand, easy credit and generous incentives combined to fill dealer showrooms. The industry sold 1.44 million cars and light trucks last month, up 15.8 percent from a year ago.

Ford’s U.S. sales grew 23 percent in September, Nissan surged 18 percent and Fiat Chrysler’s U.S. sales jumped nearly 14 percent. Sales at General Motors rose 12 percent, while Toyota posted a 16 percent gain. Hyundai’s sales were up 14 percent and Honda’s rose 13 percent.

Analysts had expected big increases because Labor Day was included in September this year versus August a year ago. Labor Day weekend is typically one of the biggest sales periods of the year, as dealers offer discounts to clear cars off their lots before the new model-year vehicles arrive.

The Volkswagen brand struggled after Sept. 18, when the U.S. government revealed that nearly 500,000 VW and Audi diesels sold in the U.S. had software that let them cheat on emissions tests. Volkswagen halted sales of 2015 and 2016 diesel models of the Passat, Jetta, Golf and Beetle.

Right now, the scandal appears to only be hurting only the German automaker. VW’s sales were up less than 1 percent over last September. Diesels accounted for just 11.7 percent of the company’s total sales, compared with the usual 20 percent.

The U.S. market has remained a bright spot for automakers as the Chinese economy slows. China is still the No. 1 market globally, but sales there were up just 2.6 percent in the first eight months of the year. U.S. sales grew nearly 4 percent in that time period. “The economy still has room to grow and so do auto sales, particularly now that the (millennials) are entering the workforce and starting households,” said GM’s chief economist, Mustafa Mohatarem, in a statement from the company.

There was a bright spot for Volkswagen. Its luxury Audi brand – which has one model, the A3, involved in the scandal – saw sales climb 16 percent and said September was a record month for the brand in the U.S. Sales of Audi’s big SUVs like the Q5 and Q7 were strong, and A3 sales rose 16 percent.

General Motors Co. sold 251,310 cars and trucks. Total Chevrolet sales rose 11 percent, and the company said GMC had its best September since 2004.

Ford sold 221,599 vehicles, with its F-Series pickup truck – the top-selling vehicle in the country – climbing 16 percent to more than 69,000 trucks. Ford’s Lincoln luxury brand notched a 20 percent sales increase thanks to new SUVs.

Toyota sold 194,370 vehicles. Prius hybrid sales rose 12 percent despite relatively low gas prices, while RAV4 SUV sales jumped 18 percent.

Fiat Chrysler sold more than 193,000 vehicles for its best September since 2000. Jeep sales rose 40 percent, offsetting slower growth elsewhere. Sales for the company’s Ram and Dodge brands climbed 4 percent and 3 percent, respectively.