Getting code U1000 and have tried the 3 possible cause fixes

Question

I have cleaned all ground connections, replaced IPDM and TCM, checked and tested all fuses with no luck.

Answer 1

The U1000 code means that the Engine Control Module (ECM) cannot communicate with another control module. Unfortunately, the code doesn't specify which another control module is not communicating. At this point, instead of replacing other control modules, I suggest having the dealer run a CAN diagnosis system with the Nissan CONSULT. The diagnostic procedure should be able to test communication with each control module and determine with which one is having a problem communicating.

U1000 INFINITI - CAN Communication Line - Signal Malfunction
Read more: https://www.autocodes.com/u1000_infiniti.html