DETROIT — Chrysler, Nissan, General Motors and Honda all reported U.S. sales gains last month as falling gas prices and an improving economy boosted sales of pickup trucks and SUVs.

The companies this morning reported their sales.

Chrysler said its U.S. sales rose 22 percent to 170,480 for its best October since 2001, while both Nissan and Honda posted their best October ever. Nissan sales were up 13 percent over a year ago, while Honda’s rose nearly 6 percent.

General Motors says its October sales rose slightly as pickup truck sales jumped but some top-selling car models faltered.

The automaker had a 0.2 percent increase.

GM was led by the Chevrolet Silverado and GMC Sierra pickup trucks, which both posted gains above 10 percent. The company sold nearly 50,000 Silverados alone.

Nissan said low gas prices and high consumer confidence pushed up sales for most of its model lineup.

“We expect that these factors will continue to boost auto sales for the last two months of 2014.” said Fred Diaz, Nissan’s U.S. sales and marketing chief.

Nissan and Infiniti brands sold just over 103,000 cars and trucks last month. Nissan sales rose almost 15 percent while the Infiniti luxury brand was down 1 percent.

At Chrysler, the red-hot Jeep brand led the way with a 52 percent increase over a year ago. The company sold nearly 16,000 Cherokees as the small SUV again unseated the Grand Cherokee as the brand’s top seller.

Honda said its sales rose to 121,172. Honda brand sales were up 5.5 percent, while luxury Acura brand sales rose 8 percent thanks to demand for the new TLX sedan.

Sales of Honda’s best-seller, the CR-V small crossover SUV, jumped 30 percent to 29,257.