I have one on my 03, and had a major headache with it, but now works great! heres what happened on mine, may be useful. One of the wires where it connects on the trans wasn't getting a good connection, when I crimped it, the crimp broke inside and I couldn't tell. After much , the thing fell out and I fixed it with some better crimps. Then it was doing all sorts of weird things a few days later, they even sent me a new control box, and was still being weird. Checking all the power and everything, was always good. Finally, I took the ground off, cleaned it shining with my knife, same on the battery, tightened it real good, and, well, it worked perfect.