Here's the deal. MOST of the time, you'll get the right rear wheel speed signal fault, and it's usually the DSC module to blame. That's the same wheel speed signal that the speedometer uses to know the speed of the car, and the cruise control is tied into that too.
If you can, clear the faults, and swap the sensors, and make sure the fault stays on the same wheel. If it does, it's a DSC control unit, or maybe a dirty sensor wheel in the hub. You can spray brake cleaner into the bore while you spin the wheel to clean it up a bit.
Like mentioned above, the DSC unit will need to be coded, but it's relatively easy to change. You can try unplugging it and then plugging it back in, maybe there's a dirty pin-sometimes it works.