Preheat the grill to 400°F and clean the grates.
In a bowl, whisk together the Mexican crema or sour cream, mayonnaise, chopped cilantro, minced garlic, ground chipotle pepper, lime zest, and lime juice. Season with salt to taste and set aside.
Place the corn directly on the grill grates.
Grill the corn for about 3 minutes per side, rotating to cook evenly, until charred in spots.
Remove the corn from the grill while still hot.
Brush or spoon the crema mixture generously over each ear of corn, coating all sides.
Sprinkle the crumbled cotija cheese evenly over the corn.
Serve with lime wedges.