By REBECCA R. RUIZ and DANIELLE IVORYJULY 15, 2014  The car crash that killed Gene Erickson caught the attention of federal regulators. Why did the Saturn Ion he was traveling in, along a rural Texas road, suddenly swerve into a tree? Why did the air bags fail? General Motors told federal authorities that it could not provide answers.  But only a month earlier, a G.M. engineer had concluded in an internal evaluation that the Ion had most likely lost power, disabling its air bags, according to a subsequent internal investigation commissioned by G.M.  Now, G.M.'s response, as well as its replies to queries in other crashes obtained by The New York Times from the National Highway Traffic Safety Administration, casts doubt on how forthright the automaker was with regulators over a defective ignition switch that G.M. has linked to at least 13 deaths over the last decade.  They provide details for the first time on the issue at the heart of a criminal investigation by the Justice Department: whether G.M., in its interaction with safety regulators, obscured a deadly defect that would also injure perhaps hundreds of people.  The company repeatedly found a way not to answer the simple question from regulators of what led to a crash. In at least three cases of fatal crashes, including the accident that killed Mr. Erickson, G.M. said that it had not assessed the cause. In another fatal crash, G.M. said that attorney-client privilege may have prevented it from answering. And in other cases, the automaker was more blunt, writing, “G.M. opts not to respond.” The responses came even though G.M. had for years been aware of sudden power loss in the models involved in the accidents.  The responses are found in documents known as “death inquiries,” which The Times obtained through the Freedom of Information Act. In those inquiries, regulators ask automakers to explain the circumstances surrounding a crash to help identify potential defects in cars.  On Thursday, the head of G.M.'s legal department, Michael P. Millikin, is expected to face intense scrutiny before lawmakers at a Senate hearing. He is scheduled to testify along with, among others, Mary T. Barra, the chief executive, who faced a harsh grilling before the same panel in April.  The Times asked the safety agency for death inquiries related to fatal crashes in older Chevrolet Cobalts and Saturn Ions, which are among the 2.6 million cars with defective ignition switches that G.M. has recalled since February. Of the 13 deaths linked to the defect, all of which involved Cobalts and Ions, The Times received inquiries for four of them.  Mr. Erickson was riding in the front seat of a Saturn Ion driven by Candice Anderson in 2004. They were an hour from Dallas when the car suddenly drove into a tree, killing Mr. Erickson but sparing Ms. Anderson. Only recently did Ms. Anderson, who pleaded guilty to criminally negligent homicide after the accident because she had a trace of Xanax in her system, learn that she was not to blame.  Despite the earlier determination by the engineer, Manuel Peace, that the engine’s shutting off had most likely been the reason for the crash, G.M., in its response to regulators, said there may not have been “sufficient reliable information to accurately assess the cause” of the incident.  G.M., which also faced a lawsuit from Mr. Erickson’s family at the time, further stated that attorney-client privilege may have been a reason it could not make disclosures.  Ultimately, G.M. said it had not assessed the cause of the accident.  “It seems inconsistent,” said Carl Tobias, a law professor at the University of Richmond, who specializes in product liability. “It seems like the company knew that the accident was attributable to power loss. It does sound like they didn’t give N.H.T.S.A. everything they should have. That could make them vulnerable to the Justice Department’s investigation.”  When asked about G.M.'s responses to the government’s death inquiries, James Cain, a spokesman, said on Tuesday: “We are confronting our problems openly and directly. We are taking responsibility for what has happened and making significant changes across our company to make sure that it never happens again.”  In a later death inquiry, G.M. chose not to say whether it had looked into the circumstances of the December 2009 crash in Tennessee that killed Seyde Chansuthus, who is also counted among the 13 victims. G.M. added in its response that any privileged material related to the case would not be shared. The company had not been sued by Ms. Chansuthus’s family at the time.  But there had already been a thorough review of Ms. Chansuthus’s accident within G.M.  Nearly a decade ago, Rhonda Erickson’s son died in a car accident. It is now known his is one of the thirteen deaths tied to General Motors’ ignition switch malfunction.  Six days before that letter to regulators, lawyers representing G.M. had presented an evaluation of the crash to the automaker, according to the internal investigation conducted by G.M. this year. The lawyers warned that G.M. could be liable for punitive damages because air bags in Cobalts were known not to deploy in some cases.  In a third fatal crash, involving the deaths of Amy Rademaker and Natasha Weigel, teenage friends killed in Wisconsin in 2006, G.M. again responded that it could not provide an answer to what caused the accident, using the same language as in its reply to questions about Mr. Erickson’s crash.  In this case, G.M. had received outside evidence that there was a problem with the switch, including a state trooper’s collision report from February 2007 that made the critical link between the faulty ignition switch and the air bags failing to deploy. G.M.'s internal investigation said that only one person inside G.M. had even opened the report, though it was included in the reply to regulators, who also failed to follow through. One of the requirements on the death inquiry is to provide a copy of the police report.  When asked for comment, David Friedman, the safety agency’s acting administrator, said, “G.M.'s decision-making, structure, process and corporate culture stood in the way of safety.”  G.M.'s reluctance to respond to the government with evaluations of suspicious crashes extended beyond just the accidents that the automaker has publicly linked to its ignition defect.  Several fatal crashes — including those of Benjamin Hair, 20, in Virginia, and Amy Kosilla, 23, in New York — also had death inquiries. In both those cases, when asked to explain why the vehicles had driven straight off the road — with front impacts and no air bag deployment — the automaker took advantage of the optional nature of the question and did not reply. Death inquiries date back to the late 1990s, when the safety agency was criticized for failing to spot highway rollovers in Ford Explorers with Firestone tires, a problem eventually tied to 271 deaths.  In response, Congress passed a law in 2000 requiring automakers to report to regulators any claims they received blaming defects for injuries or deaths, so the government would not have to rely only on consumer reports. The agency also has the ability to dig deeper into any of those claims by then doing a death inquiry — asking the automaker for documentation of each car accident and an assessment of the circumstances leading to each crash.  In the end, both G.M. and those charged with overseeing the company fell short in protecting the public, Mr. Tobias, the law professor, said. “It’s discouraging to see that both the company was not being as straightforward as it might have been,” he said, “and that N.H.T.S.A. was not being as rigorous about these inquiries that it should have been.”  A version of this article appears in print on July 16, 2014, on page A1 of the New York edition with the headline: Documents Show G.M. Kept Silent on Fatal Crashes. 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When asked by federal regulators to explain deadly crashes, G.M. repeatedly said it had no answers — despite having reached internal conclusions on the causes.