do you have a radio/receiver from another rc to try?
If you do, it is best to check, tho it is 95% likely that the receiver got wet and kicked the bucket.
For future reference, anytime you wanna drive in snow or mud/water and your receiver isn't waterproof, put it in a balloon and ziptie the end where the wire comes out.
I noticed that many of the Redcat models are going waterproof gear tho.