Class action lawyers are seizing on service bulletins as they look for new cases to bring against auto makers, raising the risks for manufacturers when they notify dealers of possible vehicle problems.

The so-called technical service bulletins have surfaced in purported class action lawsuits accusing BMW AG of leaky roofs; Honda Motor Co. of defective torque converters; Land Rover of tire alignment problems; Mazda Motor Corp. of faulty engine valves; and Ford Motor Co. of spark plug issues; as well as in dozens of other cases in recent years.

Auto makers have used the bulletins for decades to alert dealers to potential problems with their cars and trucks. Plaintiffs' lawyers increasingly deploy them in class actions, in support of claims auto makers knowingly sold defective products.

"They basically tell us what the manufacturer knew and when they knew it," said Joseph R. Santoli, a New Jersey lawyer who represents customers in a class action against BMW. "Unfortunately, buyers are not told about these problems ahead of time."

The service bulletins have appeared in lawsuits for decades but are now commonplace, as plaintiffs' lawyers have peeled away from personal injury work to focus on suits against auto makers, which are less expensive to pursue, lawyers said.

Auto makers say the litigation hasn't altered their practices.

A spokeswoman for Jaguar Land Rover said, "We agree the plaintiff's bar uses Technical Service Bulletins as a basis for class-action suits, but that does not change our practice to continue to provide clear technical guidance to our retailers." The spokeswoman added that the tire-wear litigation was resolved in a settlement.

BMW, Honda, Mazda and Ford didn't respond to requests for comment.

Class actions involving motor vehicles settle for more money, on average, than those involving other industries. A study of settlements from 2010 to 2013 by National Economic Research Associates found that the average automotive class action netted $247 million. The majority of cases that survive auto makers' initial motion to dismiss end up settling, according to defense lawyers.

The increase in class action claims has followed more aggressive policing of the industry by prosecutors and regulators, industry experts said, including the continuing criminal investigation of General Motors Co. for an ignition-switch defect that has been linked to more than 100 deaths. The company is also facing private lawsuits. Two bulletins GM issued in 2005 and 2006 are central to the litigation, according to one of the lead lawyers for the plaintiffs.

"We don't let litigation risk get in the way of vehicle quality, customer satisfaction or safety," said a spokesman for GM. "From our standpoint, we have to completely put that in the background. If it's going to happen, it's going to happen."

Last year, Japan's Toyota Motor Corp. agreed to pay $1.2 billion to settle a U.S. criminal investigation into its disclosure of safety problems related to unintentional acceleration in some of its vehicles.

Toyota declined to comment for this article.

"[Auto makers] are being monitored in a way they weren't before by class lawyers and the National Highway Traffic Safety Administration," said Sean Kane, president of Safety Research & Strategies Inc., a safety research firm that has been critical of GM and Toyota.

As a result, auto makers have shown more of a willingness to issue recalls in lieu of technical service bulletins, Mr. Kane said. Some 64 million vehicles were recalled in the U.S. in 2014, a record number, according to government data.

The service bulletins are meant to notify dealers of problems that have been reported by drivers, mechanics and others and to outline any necessary fixes. They can apply to minor problems like a faulty air conditioner or cup holder but also to problems that can turn out to be bigger.

It isn't clear yet whether any vehicle issues aren't being announced in bulletins because of the increased risk of legal exposure.

The National Highway Traffic Safety Administration posts free summaries of service bulletins on safercar.gov. Some auto makers will release full bulletins upon request, and repair shops have access to them, but otherwise the bulletins are only available for a fee from independent companies. The NHTSA didn't respond to requests for comment.

For years, safety advocates have pressed federal regulators and the industry to make the bulletins easily accessible to the public. But the industry has declined to make them widely available, saying the bulletins are copyrighted and are technical communications that aren't aimed at the consumers.

Plaintiffs' lawyers said class actions have leveled the playing field for car buyers, who often learn of the service bulletins after they make their purchase, if ever.

"The bedrock of consumer protection is consumer choice," said John Keefe, a New Jersey lawyer who represents vehicle owners. "I don't think these service bulletins do anything in that regard to protect consumers."

At least one federal judge has questioned plaintiffs' lawyers use of service bulletins, in a 2011 ruling dismissing a class action against BMW over an alleged burnt crayon odor in one of its best-selling models.

"The court is hesitant to view technical service bulletins, or similar advisories, as potential admissions of fraudulent concealment of a defect," wrote U.S. Senior District Judge Dickinson R. Debevoise in New Jersey. "Accepting these advisories as a basis for consumer fraud claims may discourage manufacturers from responding to their customers in the first place."

Neal Walters, a New Jersey lawyer who represents auto makers, said: "Vehicles are complex bundles of parts. I don't think anyone reasonably believes they will be perfect…It's unfair to penalize a product company because it learned how the product may not be perfect after sale and takes steps to improve it."

Write to Joe Palazzolo at joe.palazzolo@wsj.com

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