Causes and Fixes U0073 Code: Control Module Communication Bus "A" Off

How to fix a U0073 Code: Control Module Communication Bus "A" Off The U0073 means control modules and CAN Bus are not communicating correctly. The CAN (Controller Area Network) is a protocol that allows the ECM, PCM, TCM, and ABS modules to communicate with each other. Diagnosing a U0073 can be difficult and time-consuming. Possible Causes of a U0073 Code: Blown Fuse Issues with Alternator Charging or Battery Wiring Issue Such as Damaged Wires or Poor Connections Faulty Control Module www.backyardmechanic.org By using this information user assumes all risk of use.