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There are several reasons for a wisteria not blooming, but the most common is too much nitrogen. Adding some bone meal to the soil should help. This article can give you some other ideas too: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

Check the roots for galls. It sounds like something may be attacking the roots.

If it has received sufficient watering and has no other symptoms, then it is likely a fungus causing that. Treat the plant with a fungicide (like neem oil) and that should fix it. If it has been recently planted, it could be due to air pockets in the soil which are preventing the roots from taking up water. If this is the case, flood the area with water and tamp the soil down around the plant to collapse the air pockets.

These articles should help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-no-leaves.htm
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

This article should help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

Are you talking about the leaves or is this a yellow flowered wisteria?

If you are talking about the leaves, they aren't suppose to be yellow. This indicates a health issue with the plant. Once the issue is corrected, it returns to a green and healthy leaf color.

If you have a yellow flowered wisteria, it will rebloom next spring. They bloom in early to mid spring and are green for the remained of the season after the flowers fall.