There's no single GPA requirement to play Division II volleyball. The minimum GPA needed varies significantly depending on the specific university, the individual coach's standards, and the overall competitiveness of the team. While some DII schools might have a general academic eligibility requirement (often around a 2.0 GPA), a significantly higher GPA will almost certainly be needed to be seriously considered for a roster spot, especially at more competitive programs.
To find the specific requirements, you need to research the academic requirements and athletic standards of the individual DII colleges and universities you are interested in attending. Contact the volleyball coach directly at each school is the best way to get the most accurate information.