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 www.backyardmechanic.org By using this information user assumes all risk of use.