After firing salvos at Chrysler, NHTSA aims canons at GM. Federal safety investigators are upgrading an investigation of more than 550,000 Pontiac G6s from 2005-06 due to reports of
malfunctioning brake lights. The agency announced the action today. The National Highway Traffic Safety Administration (NHTSA) has been investigating the issue since February after reviewing hundreds
of reports that the brake lights may operate incorrectly.
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