U0066
Vehicle Communication Bus E (+) Open
U0066 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus E (+) Open. Common causes: can high wire break, corrosion of can bus connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine Light Is On
- Incorrect operation of electronic systems
- Lack of communication with diagnostic equipment
- Dashboard malfunctions
- Errors in other modules
Causes
- CAN High wire break
- Corrosion of CAN bus connectors
- Wiring harness damage
- Malfunction of one of the network modules
- Problems with module power supply
How to Fix
- Check the integrity of the CAN High and CAN Low wires
- Inspect connectors for corrosion
- Check the resistance between the CAN lines (should be about 60 ohms)
- Diagnose modules for faults
- Repair or replacement of damaged wiring sections
Related codes
Error U0066 by Vehicle Brand
FAQ
What does the U0066 code mean?
U0066 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus E (+) Open
What causes a U0066 error code?
The most common causes of U0066 include: CAN High wire break; Corrosion of CAN bus connectors; Wiring harness damage; Malfunction of one of the network modules.
How do I fix a U0066 diagnostic trouble code?
To fix U0066: Check the integrity of the CAN High and CAN Low wires. Inspect connectors for corrosion. Check the resistance between the CAN lines (should be about 60 ohms). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0066?
Do not drive — repair immediately
How much does it cost to fix U0066?
The estimated repair cost for U0066 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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