the valve body is fine it only controls tcc enable oil which comes on in 2nd which it is doing the solinoid controls the tcc apply valve wich is in the pump. To see if the computer is working properly all you have to do is find the F terminal in the aldl connector [the one scan tools are attached to] stick in a 12 volt test light with key on the light sould be dim . step on the brake the light should be bright. Bring the truck up so speed warmed up 50 mph and the light should go out.