CADILLAC STS WARNING LIGHT

My Car Has The Battery Light On The Dash N Says Battery Voltage High, My Question Is Whats Causing That

My Car Won't Shift After 40mph. The Service Engine Light Comes On And Gives Me The Codes S038 & S073. Car Drives Fine If I Keep It At 35mph...

What Would Be The Most Efficient And Cost Friendly Device, Availible To The Public, That Would Check Trouble Codes, And Clear The Check...

So Tonight, Driving Home My No Traction Control Light Came On With My Engine Light. Wouldn't Drive. Rpms Kept Going Up. No Propulsion...