what are other possible causes for speedo not to function? on 2000 Jeep Grand Cherokee

I swithced out the speed sensor and I check the connnector to verify wires are live. signal is getting lost in the dash or under the hood. CEL gives code for bad speed sensor but that is not the problem. thanks

Asked by for the 2000 Jeep Grand Cherokee
PCM or wire/connector fault between PCM/guage/sensor. Live data rather than just a 'code reader' may be more helpful.