Could someone please tell me what would cause the Trac control light to flash and the ABS light to stay on. they both came on at the same time. The Trac light continues to flash and the ABS stays on.

Could someone please tell me what would cause the Trac control light to flash and the ABS light to stay on. they both came on at the same time. The Trac light continues to flash and the ABS stays on.
it could actually be a number of things, both functions(ABS and Traction control)are controlled by the same module which means that failure for common components(such as speed sensors or the module itself) could cause both indicators to come on