Sergio Marchionne's campaign to find a buyer for Fiat Chrysler Automobiles was dealt a blow Wednesday, as an influential quality study ranked three of the auto maker's brands as the worst performers in the auto industry.

J.D. Power said the Chrysler, Jeep and Fiat brands are rated by surveyed buyers as having among the most quality problems in the initial three months of ownership. The California research firm, owned by McGraw Hill, said South Korean brands and Germany's Porsche AG top the industry, while Japanese makes have lost their footing as leaders.

The results, compiled by surveying 84,000 U.S. vehicle buyers after their initial 90 days of ownership earlier this year, underscore one of the biggest challenges facing FCA Chief Executive Mr. Marchionne as he scrambles to find a suitor for the Italian-American auto maker. FCA faces consistent criticism for underinvesting in its product line, and concerns that the product portfolio is insufficient to keep up with technology advances and increasingly stringent fuel economy standards.

Jeep, Chrysler and Fiat brands were all rated by buyers as having more than 140 problems per 100 vehicles sold, putting them well below the industry average of 112. Fuji Heavy Industry's Subaru and Daimler AG's Smart accompanied the FCA at the bottom.

Dodge also fell below the industry average, while the Ram truck lineup finished slightly above.

Fiat's chief executive for more than a decade, Mr. Marchionne began acquiring Chrysler as part of the U.S. company's 2009 bankruptcy and has recently approached several other auto makers about a potential merger. Fiat Chrysler has posted solid U.S. growth in the six years since filing bankruptcy, with much of the momentum coming amid sustained demand for Ram trucks and Jeeps, but Mr. Marchionne says his company has less-than-stellar margins, and the wider industry needs to consolidate if it hopes to thrive in the future.

J.D. Power's quality analyst, Renee Stephens said during a presentation Wednesday that the industry's initial quality scores improved in 2015's study vs. the prior year. She said Japanese brands slipped below industry average, and domestic Big 3 auto makers—including General Motors Co.—are essentially equal with Japan's car companies after years of being far outpaced by them.

"The big story," Ms. Stephens said, is the emergence of South Korean auto makers Kia Motors and Hyundai Motors as quality kings and the strong performance of many of their cars, crossovers and minivans in a survey it was once known for tanking. While Germany's Porsche AG is the highest performer with 80 problems per 100, the two South Korean sister brands are by far the best among mainstream brands, with Kia owners reporting 86 problems and Hyundai owners reporting 95.

Together, the pair own about 12% of the U.S. market share. Once a bit player with a poor quality image, Kia and Hyundai have built consistent gains in sales and reputation over the past 15 years as new products have been launched and new North American production capacity.

This marks the second straight year Hyundai has been a top performer. Ms. Stephens cited newly-launched products and a focus on technology as reasons Hyundai and Kia are leading other brands, including Toyota Motor Corp., Honda Motor Co. and Ford Motor Co.

"This is a clear shift in the quality landscape," Ms. Stephens said. "For so long, Japanese brands have been viewed by many as the gold standard in vehicle quality. While the Japanese automakers continue to make improvements, we're seeing other brands, most notably Korean makes, really accelerating the rate of improvement."

Ms Stephens said Chrysler's relatively new 200 sedan had a bumpy launch in terms of quality. She said a new 9-speed transmission is cited by buyers as being below expectations, and is one of the reasons the 200 and the rest of Chrysler's lineup is suffering.

Ms. Stephens said paint problems, fit-and-finish, and other "defect malfunctions" hold Chrysler back. These are items that are often addressed on the assembly line, she said.

Write to John D. Stoll at john.stoll@wsj.com

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