I've read the posts on here about the ITBC but mine has never worked,it works in the truck but I have no power to the trailer brakes.The trailer brakes work on my friends truck and I checked the connections all the way to the front no lose or grounded wires fuses are all good.Does anyone think it is the pressure sensor on the master cylinder?

Mine took a crap, and the dealer refused to replace it under warranty b/c it was "working" just not well enough to stop the trailer. If yours is totally dead, it should be a warranty issue if you're still covered.

Check the voltage out off the pressure sensor - I think you're looking for 5V at full output. If I remember, it was only around $45 from rockauto - bleed the brakes and be done.