 Assembly of the Volt was assigned to Detroit / Hamtramck Assembly plant following the conclusion of the 2007 UAW @-@ GM contract talks . For initial production the gasoline engine is being imported from the Opel engine plant in Aspern , Austria . In November 2010 , General Motors began investing US $ 138 @.@ 3 million at its engine operations plant in Flint , Michigan to support increased production of the Ecotec 1 @.@ 4 L engine that is used in the Chevrolet Cruze , the upcoming 2012 Chevrolet Sonic , and the variant used in the Chevrolet Volt . The Flint plant was expected to start production of 400 engines a day in early 2011 , ramp up daily production to 800 engines in late 2011 , and to increase its capacity to 1 @,@ 200 a day by late 2012 . In May 2011 , General Motors decided to invest an additional US $ 84 million at the Flint plant to further increase 1 @.@ 4 L engine production capacity . 
