Service Stability System???
I have recently replaced my front wheel hubs, which includes the wheel speed sensors. After replacing these, everything worked fine for a couple weeks. Then for several days, my low traction light would flash on/off while just driving down the highway. The next symptom was that the anti-lock brakes would activate during normal braking (no wheel lockup). This would happen until I would get the 'Service Stability System' message, disabling the anti-lock brakes and traction control.
Now, I get the 'Service Stability System' message immediately upon starting the car (before the car moves).
I have checked the connections and added dielectric grease with no improvement.