My reverse stopped working with no warning no sounds nothing everything else works

What is your question?

Truck works completely fine was out playing came home 2hrs goes by I go to back out of driveway and the reverse mist revs up nothing ever popped or grinded it's never got hot

What makes this problem better or worse?

Dosnt change

How long has your 2002 Chevrolet Silverado 2500 HD had this problem?

Week