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WASHINGTON – After a series of blistering statements from lawmakers Tuesday, General Motors’ chief executive, Mary T. Barra, expressed deep remorse at a House hearing for the automaker’s decade-long failure to recall defective vehicles linked to 13 deaths.

But Barra offered scant new information in her opening remarks about how and why GM repeatedly failed to fix faulty ignition switches on Chevrolet Cobalts and other compact cars, despite conducting multiple internal studies of the problem since 2001.

“I cannot tell you why it took years for a safety defect to be announced in that program, but I can tell you that we will find out,” she said, adding, “I am deeply sorry.”

In her testimony, Barra was expected to make news by announcing that GM had hired a global safety director. She did that, but she also said GM had hired Kenneth R. Feinberg, a lawyer who specializes in apportioning restitution payments in major disasters – including the terrorist attacks of Sept. 11, 2001, the BP oil spill in the Gulf of Mexico and the Boston Marathon bombing.

Her appearance before a subcommittee of the House Energy and Commerce Committee represented a significant new phase in the company’s crisis since it issued recalls that began in February for 2.6 million Cobalts and other vehicles.

Rep. Tim Murphy, R-Pa., chairman of the Oversight and Investigations Subcommittee, said: “What we have here is a failure to communicate and the results were deadly.”

Members of Congress and the families of people killed in GM cars are urging Barra to declare the cars unsafe to drive until new ignition switches are installed. So far, GM has said the vehicles are safe to operate as long as there are no objects attached to the ignition key.

And GM is coming under increasing pressure from lawmakers to establish a fund to compensate victims of accidents in recalled models. The automaker currently has legal immunity from safety lawsuits related to accidents that occurred before it emerged from bankruptcy in July 2009.

Again and again, Barra deflected questions by telling members of the panel that she knew almost nothing about the problem until Jan. 31 and will await the results of an internal investigation being conducted by Anton Valukas, a former U.S. attorney from Chicago, before assigning blame.

The chairman of the House committee, Rep. Fred Upton, R-Mich., said the hearing was the first step in discovering why GM did not recall flawed vehicles sooner, and why the National Highway Traffic Safety Administration did not formally investigate the possibility of defects after reports of fatal accidents.

“Documents produced to the committee show that both NHTSA and GM received complaints and data about problems with ignition switches and air bags,” Upton said in his opening remarks. “These complaints go back at least 10 years.”

Besides the congressional inquiry, the company’s actions are under investigation by NHTSA, which itself is being scrutinized, and the Justice Department. In addition, several lawsuits have been filed on behalf of the families of accident victims.

On Monday evening, Barra met privately with 22 family members of accident victims at GM’s offices in Washington.

The two-hour meeting came at the request of Robert Hilliard, a Texas lawyer who is representing families and has filed a class-action lawsuit against GM.

“These folks told her about their losses, and everyone in the room got a chance to speak,” Hilliard said. “It was pretty raw and emotional.”

Hilliard described Barra as “very thoughtful and very attentive” as family members described the pain of losing loved ones in accidents involving Cobalts and other cars that have been recalled for faulty switches.

A GM spokesman, Greg Martin, confirmed the meeting took place, but declined to comment further. “Out of respect for the families, we are not providing details,” he said. The families held a news conference Tuesday at the Capitol.

GM conducted several internal investigations of the switch problems, dating back as far as 2001. Company engineers learned that the key in the ignition could be inadvertently bumped into the off or accessory position, causing the engine to lose power and disabling air bags.

Documents show that GM approved the switch for installation in its compact cars in 2002, despite data from its supplier, Delphi, that the key turned too easily in the ignition.

Delphi officials told House investigators that sample testing of the switch showed that the force required to turn it were below the specifications set by GM.

The automaker then rejected changes to the switch in 2004 and 2005 despite becoming aware of consumer complaints about the weak switch, filings to safety regulators and lawmakers show.

In July 2005, the company and NHTSA learned of a fatal accident in Maryland that killed a young woman. It was the first of what would become a series of incidents in which vehicles suddenly lost power and air bags failed to deploy in a crash.

GM and Delphi changed the switch in 2006, and stronger switches were installed in Cobalts and other small cars beginning in the 2007 model year. But records show that those switches still did not meet the automaker’s own recommended torque requirements.

Federal safety regulators made an internal recommendation to open a formal defect investigation in 2007 after receiving information about four fatal crashes involving air bags that failed to deploy. But the agency declined to pursue a formal investigation because, it said, it “did not identify any discernible trend.”

Three years later, the regulators also considered a Cobalt investigation but declined because “the data did not show a trend,” documents show.