Why does Traction control light and warning alarm sound after stepping on brake?

Hello, Georgetown, Texas! My daughter was born at St. Davids... small world. Anyways, this could be anything from an ABS sensor (as you have addressed) to the ABS control module. Your brakes working normally will indicate that the fault is most probably electronic in nature, and since the fault shows up when you press the brakes, your brake light switch is working. That only leaves a couple of items in the circuit: Check fuses 6 and 33 under the hood, then fuses 22 and 18 on the left side of the dash. Test the traction control switch Test the brake fluid level sensor (and check the brake fluid level). Also, test the ground for the sensor. Test the brake booster sensor (no additional ground for that one) Then, if you still have the issue, you need a diagnostic scan to test the stability control cluster, ABS control module, and the steering wheel position sensor.