Cook pasta per package instructions. Drain thoroughly then place pasta in a large bowl and set aside.
Preheat grill.
Once grill is nice and hot place corn directly on grates.
Cook corn for 3-4 minutes per side until corn begins to char.
Once all sides have been slightly charred, remove from grill.
Remove corn off the cob standing corn firmly up on a cutting board and with a sharp nice carefully removing kernels.
Alternatively place a small bowl upside down inside a large mixing bowl. Hold corn standing up on top of inverted bowl and carefully run a down the side of the corn to remove the kernels.
Reserve about 3/4 cup of the kernels and place the remaining kernels in a large bowl along with cooked pasta.
Add 1/2 cup cilantro and 1/2 cup green onion to pasta.
In a medium bowl mix together grated cotija cheese, mayonnaise, sour cream, lime zest and juice, garlic and a dash or two of chipotle chili pepper until blended.
Season sauce with a pinch of salt and pepper to taste.
Pour sauce in with pasta and corn and toss to coat.
Transfer pasta to a serving bowl and top with reserved corn and remaining 1/2 cup cilantro and 1/4 cup green onion.
Refrigerate until ready to serve.
Notes
You can find Chipotle Chili Pepper in the spice aisle.