Ok, I checked for broken wires and found none and now I have just installed the speed sensor and I still have the same problem. The speedometer won't work unless the vehicle is going 25 mph and this doesn't hold true all the time now. The check engine light still comes on and it won't upshift at all. Any new suggestions?88pathoffroad said:The sensor unscrews from the transmission. There's no cable. Check for loose or broken wiring first, then replace the sensor if nothing else is wrong.