The largest applies to 2.4 million cars recalled for wiring problem. Those affected are the 2004-2012 Chevrolet Malibu, 2004-2007 Chevrolet Malibu Maxx, 2005-2010 Pontiac G6, and 2007-2010 Saturn Auras.
GM says the issue is tied to 13 accidents and two injuries. The company issued a service bulletin to dealerships in 2008 about the flaw but never ordered a recall.
GM estimates the recalls will cost $200 million to fix.