PONTIAC, Michigan (Reuters) - General Motors Co
GM will build a 138,000 square-foot wing to the site, to be completed in the second half of 2014.
The investment is part of the U.S. automaker's previously announced plan to spend $1.5 billion on its North American facilities this year, up from the $436 million last year. GM invests $8 billion annually in its operations globally.
On Monday, GM said it would invest $600 million to expand its car assembly plant in Kansas City, Kansas.
Pontiac is in suburban Detroit.
(Reporting By Ben Klayman; Editing by Gerald E. McCormick)