By Mike Spector 

A former General Motors Co. engineer who worked with faulty ignition switches tied to millions of recalled vehicles and more than 100 deaths is set to be questioned in June by lawyers representing consumers suing the auto maker over the safety defect, said people familiar with the matter.

Raymond DeGiorgio, one of 15 employees who GM dismissed over the company's failure for more than a decade to recall vehicles with the defective switches, is scheduled to be deposed on June 18 and June 19 in Detroit, the people said.

Mr. DeGiorgio featured prominently in a report commissioned by GM and written by former U.S. Attorney Anton Valukas that found the auto maker failed for 11 years to recall millions of older Chevrolet Cobalts and other small cars equipped with an ignition switch prone to slipping out of the run position. The problem can result in disabling safety features including air bags, power steering and power brakes.

Mr. DeGiorgio couldn't be reached for comment. A GM spokesman said: "Depositions and other pre-trial activity are taking place and there aren't any developments in the case that require an explanation or comment at this time."

GM recalled roughly 2.6 million vehicles equipped with the switch in early 2014 and set up a victims compensation fund administered by outside lawyer Kenneth Feinberg that so far has linked the defect to 107 deaths and 199 injuries.

Mr. DeGiorgio is one of at least three dozen current and former GM employees, including Chief Executive Mary Barra, who are set to be deposed or have already been questioned as part of a set of lawsuits consolidated in federal district court in New York. Mr. DeGiorgio's deposition dates weren't yet on a schedule that Bob Hilliard, a Texas lawyer representing consumers suing GM, disclosed in March.

Mr. DeGiorgio approved putting the switch into production with a deviation from GM's specifications, then later green-lighted changing the design without formally telling anyone, according to Mr. Valukas's report. He didn't assign a new part number to the switch, which might have alerted GM to the problem, the report said. The new design increased the torque required to turn the key, alleviating the defect.

Mr. Valukas's report also cited lawyers who failed to raise alarms about the ignition switch even as they settled cases where air bags didn't deploy. Some of the lawyers were among those GM dismissed in 2014 after Mr. Valukas's report was released.

Ms. Barra's deposition in the consolidated lawsuits, known as multi-district litigation, is scheduled for Oct. 8. Ms. Barra last year bemoaned a "pattern of incompetence and neglect" at the company outlined in Mr. Valukas's report on the ignition-switch matter.

The depositions of Mr. DeGiorgio and other current and former GM employees come amid a separate U.S. Justice Department probe of the auto maker expected to result in a finding of criminal wrongdoing and a hefty fine exceeding $1 billion.

GM last year paid a record $35 million civil fine for failing to alert U.S. auto-safety regulators to the ignition-switch defect in a timely manner as required under federal law.

An April 2013 deposition of Mr. DeGiorgio in a Georgia wrongful death case helped set of the ensuing recall crisis at GM. In that deposition, Mr. DeGiorgio said he was unaware of the ignition switch's design being changed to increase its torque.

Write to Mike Spector at mike.spector@wsj.com

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