Nissan GTR R35 GR6 transmission Valve Body Solenoid DS3 is a critical component located within the oil pump. Its function is to precisely regulate hydraulic pressure for one of the primary clutches. A failing DS3 solenoid can cause erratic clutch engagement, resulting in harsh shifts and transmission fault codes. Replacing this solenoid restores the pump's proper pressure control, which is essential for preserving the legendary performance and reliability of your GTR's drivetrain.