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

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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


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