Hi Neva,
The traction control and ABS sensors are based on wheel speed sensors, one on each wheel. When those sensors get damaged, clogged with dirt/mud/tar/road grime, etc., or the wires break and they quit working or work intermittently, then you'll get all kinds of symptoms related to the ABS and/or traction control system.
That's the place I'd start, with checking the wires and making sure they aren't clogged up. You can test them electrically by hooking up a multimeter and measuring the voltage as you rotate the tire manually. Here's what you should see, according to smtnet.com.
[quote]The front wheel should be 190 - 1140mV, and the rear wheel should be higher than 650mV. If it meets the requirements, it means that the wheel speed sensor is working properly at this time.[/quote]
Of course, it's always possible the ABS control module is faulty, or there is a wiring problem somewhere, but take it one step at a time and check the wheel speed sensors first, as they're the most vulnerable, being exposed to the elements and possibility of damage.