It follows a petition by the Indian Solar Manufacturers Association.
The dumping margins related to the products under investigation have not been disclosed, with the ministry merely saying they exceed the 2 percent threshold.
The Trade Remedies Authority of Vietnam said producers and exporters should contact the Indian ministry to register for questionnaires, and keep breast of relevant information emanating from India.
Any action deemed uncooperative can lead to India imposing anti-dumping duties, it warned.
"High taxes will result in Vietnamese producers losing their competitive advantage and lose part or even all of the market share in India."