The company will add vehicles from the 2008-2011 model years to a recall that initially covered cars only through the 2007 model year.
The Chevrolet Cobalt, Chevrolet HHR, Pontiac G5, Pontiac Solstice, Saturn Ion and Saturn Sky are all involved in the recall.
GM says around 5,000 of the faulty switches were used for repairs on 2008-2011 model year cars. GM says it's expanding the recall to make sure it finds all the switches.
GM says it's not aware of any fatalities connected to the defect in the 2008-2011 models.
The ignition switches can move out of the run position and cause the engine to stall. The defect is linked to 12 deaths.