Control Module Communication Bus Off
Network · CAN Bus
The CAN communication bus has gone offline. Modern vehicles use CAN bus to allow all control modules to communicate. When the bus goes offline, modules lose communication causing widespread system failures.
- Short circuit on CAN bus wiringMost common
- Failed control module pulling bus lowMost common
- Corroded or damaged CAN bus connectorCommon
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Frequently asked questions
What does U0073 mean?
The CAN communication bus has gone offline. Modern vehicles use CAN bus to allow all control modules to communicate. When the bus goes offline, modules lose communication causing widespread system failures.
Is U0073 serious?
Fix promptly — multiple vehicle systems may be non-functional.
How much does it cost to fix U0073?
Repair costs for U0073 range from $200 – $800 depending on the root cause and your vehicle.
Can I drive with U0073?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.