When I had this problem several weeks ago it turned out to be corrosion on three of the terminals on the connector on the module, cleaned them up and so far touch wood have not had the warning lights on again Keith

 

It may be overkill, but at every oil & filter change / tire rotation (6,000 mile intervals) I remove and clean each wheel speed sensor using Reverend Sam's toothbrush and dish soap method, clean the electrical connectors with contact cleaner spray, and re-seal the cracked rubber boots on the rear wiring harnesses with a glob of neutral-cure silicone....

This approach stopped the frequent DSC warning faults my wife was seeing on the dashboard in September/October 2012. She has not reported any DSC warnings during the past year. Because I have the wheels off the car for tire rotation anyway, this approach adds just 20 to 25 minutes to the car's routine service that day....