is po725 code usually PCM,crank sensor or wiring related ?

Question

po725 code pending
instrument cluster not working
message center displays no bus
starter seem to work fine

Answer 1

P0725 Engine speed sensor circuit

When there is a no bus communication this is either thee TCM or ECM, depending on which control module set the code, If the TCM set the code you have a problem with the ECM, this would also be accompanied by random stalling, If the ECM set the code you have a problem with TCM.