General Motors Co. has named general counsel Michael Millikin and outside counsel Anton Valukas of Jenner & Block to cohead an internal investigation into the company’s handling of complaints related to sudden vehicle shutdowns that led to at least 13 deaths.

GM last week issued a recall [PDF] on 1.6 million cars to check for faulty ignition switches after more than 10 years of consumer complaints that engines and power systems would suddenly shut down—a bug that also disabled air bags.