The present invention relates to a method for operating a pressure control valve (7) as part of a common-Rail-system (10) in a motor vehicle having an internal combustion engine with direct injection, wherein the injection pressure via the pressure control valve (7) is regulated. In full load by a management apparatus is dependence on the pressure in the common-Rail-system (10) a battery voltage maintained high or raised in such a way that by the pressure control valve (7) are held also high fuel printings.