I have the same controler, and had this happen once, where mine said nc but still applied the brakes, but for the life of me I can't remember what I did to fix it.... Hate to have to replace it, that controler is kinda pricy :( OH!! In my case it was an intermittant short in a magnet in one of my trailer's wheels. Any chance you have a friend's trailer you can connect your truck too, long enough to see if NC goes away, and you get the numbers when you hit the petal? (if you try this, be sure to hitch up, so your truck and trailer ground) I know your trailer tested good, however our controlers are REALLY sensitive to shorts / voltage on the brake lead, and maybe whoever tested your trailer missed it? At least, if you hook to a friends trailer and your controler works, you will know for sure if it's something missed in the trailer, and if it don't work, it almost has to be in the truck harness / controler.