By Jeff Bennett and Katy Stech 

General Motors Co.'s global head of engineering is leaving the company and his duties are being split amid new fallout from the auto maker's recall of 2.6 million vehicles with faulty ignition switches and an internal probe.

John Calabrese, vice president of global vehicle engineering, is retiring after more than 33 years with the nation's largest auto maker, the company said on Tuesday. His organization is being divided to provide more clarity and accountability, said Mark Reuss, GM's executive vice president of global product development.

The new organizations are global product integrity and global vehicle components and subsystems. Ken Morris, 47, was named vice president of the integrity group, which was formed last week and is responsible for preventing safety issues during vehicle development. Ken Kelzer, 51, vice president of GM Europe powertrain engineering, will take over the group developing vehicle components and subsystems.

As part of the reorganization, GM said it would more than double to 55 a team of safety investigators working within engineering, and would require its legal department to regularly brief engineering on legal complaints involving its vehicles.

The Detroit company is revamping how it operates in the wake of recent disclosures that some engineering managers ruled out repairs as too expensive or took no actions despite years of complaints about some small cars stalling, and that its legal and product groups never discussed lawsuits and customer vehicle problems.

GM, the U.S. auto safety regulator and a U.S. attorney separately are looking at why it took the company nearly a decade to recall cars with faulty ignition switches that have been linked to accidents that caused 13 deaths. GM has said it would take action based on information that its internal investigation uncovers. That probe is expected to be completed in late May or early June.

Mr. Calabrese, 55, who took part in Tuesday's announcement and helped design the organizational changes, didn't respond to questions about his departure, which Mr. Reuss said is unrelated to the ignition-switch recall.

Mr. Calabrese was appointed to his global role in 2011. At that same time, an internal investigative team was probing within the engineering department complaints involving the faulty ignition switch. That effort was led by GM engineering executive Jim Federico, who oversaw all its compact vehicles, according to court documents from a lawsuit involving a failure switch.

Court records from a lawsuit deposition show that Mr. Federico served on the team for about a year but it unknown if he reported the situation to his superiors, which at the time would have included Mr. Calabrese.

When first asked about Mr. Calabrese in March, Chief Executive Mary Barra said she had confidence in him and in the vehicle engineering organization. "We are doing an investigation and we will go where the facts take us," Ms. Barra then said.

Since the internal investigation began in March, Ms. Barra has suspended two engineers with pay; changed the leadership of the human resources department; announced the departure of her communications chief and moved Cadillac chief Bob Ferguson back to his former role of vice president of public policy serving on Capitol Hill.

"It's not that we didn't move fast enough on different recalls, it is that we had different variations of the process," Mr. Reuss said on Tuesday. He insisted the engineering changes came from a recall-prompted review of "how the organization should be restructured."

Mr. Reuss was responding to documents released earlier this month showing GM was slow not only to act on the faulty ignition switch but other issues such as problems with electronic steering in the Saturn Ion. An email shows Ms. Barra, then head of product development, was told in 2011 of the steering issue. The cars weren't recalled until March.

"The general perception is that GM is slow to communicate, slow to act," Frank Borris, head of the U.S. National Highway Traffic Safety Administration's Office of Defect Investigation wrote in a note to GM's director of product investigations in July 2013, complaining of the auto maker's inconsistency and lack of coordination on several unrelated recall investigations.

GM is being fined $7,000 a day for failing to meet NHTSA's request to answer 107 questions related to the chronology of events the auto maker submitted to explain the recall delay. GM was to answer all questions by April 3 meaning it has accumulated $126,000 in fines as of Monday.

When asked if the engineering shake up would end the development group changes, Mr. Reuss said there is still more to come.

Meanwhile, in a lawsuit filed Monday in U.S. Bankruptcy Court in New York, lawyers who represent victims' families argued that the auto maker is wrongly hiding behind a U.S. Bankruptcy Court decision that allowed it to shift legal claims by a host of car-accident victims to a separate entity, referred to as "old GM."

The U.S. government orchestrated a Chapter 11 bankruptcy sale, which created a "new" company, now known as General Motors LLC, while leaving behind the remnants of the "old" GM in bankruptcy. In Monday's lawsuit they said General Motors "did not disclose [the problem's] existence to the Bankruptcy Court" during its quick sale.

A spokesman for General Motors declined to comment on the lawsuit.

Lawyers for victims have already filed several class-action lawsuits over the ignition switches in courts around the country, including California, Illinois and Michigan. The new GM wants the judge to bar accident victims from suing the new company over the ignition-switch defects, claiming his 2009 sale order left those liabilities with the remnants of GM left behind in bankruptcy.

Both lawyers for General Motors LLC, the operating company that emerged from bankruptcy restructuring, and lawyers for some of the victims have asked U.S. Bankruptcy Judge Robert E. Gerber to rule on the issue. When Judge Gerber signed the sale order in July 2009, he retained "exclusive jurisdiction" to interpret his decision.

Jacqueline Palank and Patrick Fitzgerald contributed to this article.

Write to Jeff Bennett at jeff.bennett@wsj.com and Katy Stech at katherine.stech@wsj.com

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