GM aims for investment grade rating in 2013: CEO

General Motors Co's top executive said he hopes the company will achieve an investment grade rating this year, adding he expects new models will help the largest U.S. automaker make modest share gains in North America this year.

Chief Executive Dan Akerson added that the company has made inroads in restructuring its European operations, but he is not yet satisfied with the automaker's current position.

GM is struggling to stem losses in the depressed and highly competitive European market where its Opel unit competes. The company has rebounded in North America since its federally funded bankruptcy restructuring in mid-2009.

Akerson was speaking at a roundtable with reporters in Detroit.

(Reporting by Ben Klayman; Editing by Nick Zieminski)