US probes GM headlight failures, may add vehicles to recall

DETROIT - The U.S. government is investigating whether General Motors should add about 312,000 vehicles to a 2015 recall for headlights that can suddenly go dark.The National Highway Traffic Safety Administration says 128 owners have complained that low-beam lights can fail.The investigation covers the 2005 and 2009 Buick Lacrosse; the 2006 and 2007 Chevrolet TrailBlazer, GMC Envoy and Buick Rainier; the 2006-2008 Isuzu Ascender and Saab 9-7X; and the 2007 Pontiac Grand Prix. At the time of the