That's not "traction." It's AdvanceTrac. The LS came with either traction control or AdvanceTrac. Saying you have one when you have the other, will lead to the wrong advice.
Since you have the AdvanceTrac warning without the ABS warning, the possibilities are narrowed down. It's either the steering angle sensor, the yaw sensor, or module configuration. In my experience, the steering angle sensor is the one most likely to give you trouble.