Causes and Fixes Nissan U1000 Code: CAN Communication Line Signal Malfunction

How to fix Nissan U1000 engine Code: CAN Communication Line Signal Malfunction
The CAN (Controller Area Network) is a protocol that allows the TCM and ECM modules, as well as other devices, to communicate with each other.
Possible Causes of a Nissan U1000 Code:
Controller Area Network (CAN) communication harness is open or shorted
Faulty Transmission Control Module (TCM)
Faulty Engine Control Module (ECM)
Poor harness ground connection.
What to Check
Battery Terminal and Cable Connections
Relay or Fuse: Engine Control - TCM - ECM
Wiring Open or Short
Damage to Transmission
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