Preheat a grill or grill pan to medium-high heat. Place the corn on the grill and cook, turning every 3 to 5 minutes, until all sides of the corn are cooked and light char marks form, about 15 minutes total. Remove from the grill.

In a small bowl, stir together the mayonnaise and lime juice and zest.

Spread the mayo mixture over the corn and sprinkle with the chili powder, Cotija, and cilantro. Season to taste with salt and serve with lime wedges for squeezing.