"High Desert soils are mostly loamy sand, deep and well-drained Entisols*
formed in alluvium fans derived dominantly from granitic rocks and related rocks."
Typical Entisol Profile
These soils have very low organic matter, are high in potassium and have pH's around 7.5 to 8.0. A saline and/or alkaline surface layer occurs in places."
Does that sound like your soil? Wisteria like a mildly acidic soil. Do you know which wisteria you have? Are the pods smooth (american) or (asian)? Do flowers come before the leaf out (asian) or after leaf out (american)? Is plenty of water more than one inch per week or less?
"Average seasonal foliar displays aside, why do wisteria leaves turn yellow in the growing season? One of the main reasons may be an iron deficiency in the soil. An easy to find soil kit can give you the answer. If iron is deficient, roots have trouble taking up nutrients. Wisteria enjoy neutral to slightly acidic soil. The lack of iron in soil will create a soil pH that is too alkaline. This is easy to amend with the addition of compost or peat. Another possible issue is poor drainage. Overly boggy, soggy soil is not a condition that a wisteria will put up with and that excess moisture will manifest in limp, yellowing leaves that will start to fall off the plant. Check your drainage and stop watering until you can maintain proper porosity."
Read more at Gardening Know How: Wisteria Leaf Problems: What To Do For A Wisteria With Yellow Leaves https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-with-yellow-leaves.htm
And always, clear pictures of both context and closeups are most helpful.