The recall follows a preliminary investigation the National Highway Traffic Safety Administration started in December, 2010. The root of the problem is reportedly a failed brake lamp switch, which can cause not only the cruise control issue, but also prevent the vehicle being shifted out of park and a failure of the brake lights.
Though the investigation by NHTSA is only a few months old, Daimler AG issued a technical service bulletin in May, 2005 to replace the faulty brake lamp switch. According to Daimler, the problem can be solved by pumping the brakes to disengage cruise, but the automaker admits that it may require an "unusually high" amount of pressure on the pedal.
Mercedes dealers will replace the switch for affected customers when the recall begins in September.