Ford Freestyle Traction Control Light

After Driving A Short While, The Traction Control Dash Light Comes On And Doesn't Go Back Off Until Turning Off The Ignition

My Tc Light Is Always On And I Have Awd Malfunction. I Took The Car To The Dealer They Said It Is The Pressure Switch(p1889). I Wish To Know...

Traction Light Came On, System Was Evaluated And Replaced The Computer As A First Effort, Now I Am Told That The Differential Is Going Bad...