OBD-II Network Error Code U0073: How to Fix It

Q: What causes OBD-II error code U0073?

U0073 is caused by a failure in the CAN bus communication network, typically due to damaged wiring, corroded connectors, failed terminating resistors, or a faulty control module that's crashing the entire network.

Q: Can I drive with error code U0073?

It's not recommended to drive with U0073 as it indicates communication failure between critical vehicle systems. This can affect engine performance, transmission operation, ABS, airbags, and other safety systems.

Q: How much does it cost to fix U0073?

Repair costs vary widely depending on the root cause. Simple wiring repairs may cost $100-300, while replacing failed control modules can range from $500-2000 or more depending on which module needs replacement.

Q: Is U0073 the same as U0073 CAN?

Yes, U0073 and U0073 CAN refer to the same error code. The 'CAN' designation simply clarifies that it's related to the Controller Area Network communication bus.

Q: Can a bad battery cause U0073?

Yes, a weak or failing battery can cause voltage drops that interfere with CAN bus communication. Always ensure the battery and charging system are working properly before diagnosing CAN bus issues.

Abstract

Error code U0073 indicates that the control module communication bus A is offline, meaning your vehicle's CAN (Controller Area Network) communication system has failed. This prevents electronic control modules from communicating with each other, which can cause multiple systems to malfunction or stop working entirely.