DETROIT (AP) — U.S. auto sales wilted in July, as hot weather and softening demand kept many buyers at home.

Sales rose less than 1 percent over last July, to just over 1.5 million new cars and trucks, according to Autodata Corp. Sales were strong at the beginning of the month thanks to Independence Day promotions, but weakened after that, Kelley Blue Book senior analyst Alec Gutierrez said.

Nissan's sales rose 1 percent to 132,475. Nissan's car sales dropped 9 percent, but strong sales of its trucks and SUVs made up for those losses. Luxury Infiniti sales fell 5 percent.

General Motors' sales fell 2 percent while Ford's U.S. sales fell 3 percent. Toyota's sales slipped 1 percent. Fiat Chrysler's sales were flat. Volkswagen's sales fell 8 percent.

Several other automakers eked out sales increases. Hyundai's sales were up 6 percent and Honda's sales rose 4 percent.

After six straight years of growth — and record sales of 17.5 million new vehicles last year— U.S. auto sales are beginning to plateau. In the first six months of last year, for example, sales were up 4 percent, or more than double the pace of this year.

Still, analysts say low gas prices, low interest rates, enticing new vehicles and strong consumer confidence should keep them at a very high level. If sales stayed at the same pace they were in July, they would reach 17.9 million this year, Autodata said.

"We're still at a healthy level as an industry," Ford's U.S. sales chief Mark LaNeve said Tuesday. "We'll adjust our plans according to the reality and temper our expectations somewhat."

Plateauing sales could be a good thing for consumers, since automakers are dialing up the discounts in order to hold on to their market share. TrueCar said industry incentives were up 5 percent over last July to an average of $3,225 per vehicle. Ford, Volkswagen, BMW and Fiat Chrysler had the biggest increases over last July, TrueCar said.

But incentives are a dangerous game for automakers, since they hurt profits and resale values and artificially inflate demand. Gutierrez said automakers are approaching a level of incentive spending last seen during the recession, and that's risky.

"The sky isn't falling just yet, but we are on an unhealthy path," he said.

General Motors Co. said its sales fell 2 percent to 267,258 vehicles. Chevrolet sales dropped but Cadillac, Buick and GMC all saw gains for the month. Sales of GM's best-seller, the Chevrolet Silverado pickup, were down 4 percent, but sales of the smaller Colorado pickup were up 27 percent.

Ford's sales fell 3 percent to 216,479. Sales were down for both its Ford and Lincoln brands. The Ford Escape SUV, a perennial best-seller, saw a 10 percent sales decline; Ford said inventories were low as it prepares to launch the revamped 2017 Escape. F-Series trucks sales were also down 1 percent as Ford prepares to launch a new Super Duty pickup.

Toyota's sales fell 1 percent to 214,233. Toyota division sales were flat but Lexus sales were down 6.5 percent. Toyota's SUVs, like the RAV4 and Highlander, saw double-digit percentage increases, but low gas prices continued to hurt its cars. Sales of the hybrid Prius were down 29 percent.

Fiat Chrysler's sales were flat at 180,727. Jeep and Ram sales both rose around 5 percent, but Dodge, Fiat, Alfa and Chrysler brand sales fell. One bright spot was minivans: Fiat Chrysler sold nearly 8,000 new Pacifica minivans and sales of the Dodge Caravan — which will eventually be discontinued — were up 28 percent.

Fiat Chrysler said its sales numbers conformed to its new reporting standards. Last week the company revised five years' worth of sales reports because they contained questionable figures. The government also is investigating charges that FCA inflated sales by pressing dealers to buy more vehicles.

Honda's sales jumped 4 percent to 152,799. Strong sales of Honda's trucks and SUVs made up for an 8 percent sales decline at its luxury Acura division.

Hyundai's sales jumped 6 percent to 75,003. Sales of the recently revamped Tucson SUV nearly doubled over last July.

Volkswagen, still stinging nearly a year after its diesel cheating scandal was revealed, saw sales drop 8 percent to 28,758. One bright spot was the Tiguan SUV, which saw sales jump 40 percent over last July.