DETROIT — Chevrolet is trying to pull more customers into its dealerships this summer by offering a money-back guarantee on new cars and trucks.

The General Motors brand said Tuesday that buyers can get refunds if they return their 2012 or 2013 vehicles for any reason. The guarantee lasts for up to 60 days from the date of purchase, and the offer ends Sept. 4.

Chevy’s marketing chief, Chris Perry, says research shows that customers like it when companies show confidence in their cars and trucks.

Customers will get the same discounted price as GM offers to employees of parts supply companies, plus any other discounts such as rebates or low-interest financing. If customers are not satisfied with the vehicle, GM will refund the purchase price. Returned vehicles cannot have more than 4,000 miles on them or be damaged.

It is not the first time an automaker has offered a money-back guarantee. GM made a similar offer in September of 2009 to boost sales as it exited bankruptcy protection. Also, when unemployment was sky-high in 2009, Hyundai Motor Corp. let customers return vehicles within the first year of ownership if they lost their jobs.

Also Tuesday, Chrysler Group LLC announced that it will bring back an offer of no payments for 90 days to help clear 2012 models from its dealer lots. The offer, which runs through August, includes the Chrysler, Jeep, Dodge, Ram, and Fiat brands financed through Ally Financial. The company made the same offer to boost sales in late May.

Chevrolet could use a sales boost from the money-back guarantee. During the first half of the year, its sales grew 6.3 percent to almost 962,000 cars and trucks. But the brand is growing at less than half the rate of overall US auto sales. The total US auto market grew almost 15 percent from January through June.

Chevy also is offering no-haggle prices to clear out its 2012 models.