Why is my tcs light on

Make sure that the button was not pressed, if not it likely has a traction or abs fault

My 2002 Odyssey had the TCS light come on when I started having EGR valve problems and then the check engine light started coming on also. Have the codes read and it may help you pin point the problem. My problem was ERG related but it was because the intakes to the EGR value were clogged with carbon. Good luck do some research it pays off!