U0073
Control Module Communication Bus A Off
U0073 is an OBD-II diagnostic trouble code meaning: Control Module Communication Bus A Off. Common causes: broken can bus wires, short circuit in can circuit. Estimated repair cost: $6–56.
Symptoms
- Check Engine Light Is On
- Disconnection or incorrect operation of various vehicle systems
- Problems starting the engine
- Dashboard malfunctions
- Lost connection with diagnostic equipment
Causes
- Broken CAN bus wires
- Short circuit in CAN circuit
- Corrosion or poor contact in connectors
- Failure of one of the modules on the bus
- Damage to CAN bus terminators
How to Fix
- Check the integrity of the CAN bus wires
- Check connections and connectors for corrosion
- Diagnose modules on the CAN bus one by one
- Check the resistance of the bus terminators
- Replace damaged wires or connectors
Related codes
Error U0073 by Vehicle Brand
FAQ
What does the U0073 code mean?
U0073 is an OBD-II diagnostic trouble code that indicates: Control Module Communication Bus A Off
What causes a U0073 error code?
The most common causes of U0073 include: Broken CAN bus wires; Short circuit in CAN circuit; Corrosion or poor contact in connectors; Failure of one of the modules on the bus.
How do I fix a U0073 diagnostic trouble code?
To fix U0073: Check the integrity of the CAN bus wires. Check connections and connectors for corrosion. Diagnose modules on the CAN bus one by one. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0073?
Do not drive — repair immediately
How much does it cost to fix U0073?
The estimated repair cost for U0073 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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