U0081
Vehicle Communication Bus F Performance
U0081 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus F Performance. Common causes: broken or damaged can bus wires, short circuit in can circuit. Estimated repair cost: $6–111.
Symptoms
- Check Engine Light Is On
- Incorrect operation of various vehicle systems
- Problems with diagnostics via OBD-II connector
- Intermittent operation of the dashboard
- The car may go into emergency mode
Causes
- Broken or damaged CAN bus wires
- Short circuit in CAN circuit
- Fault in one of the modules connected to the bus
- Problems with module power supply
- Corrosion of CAN bus connectors
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect connectors for corrosion or damage
- Check the power supply of all modules connected to the bus
- Disable the modules one by one to identify the faulty one.
- Check the resistance on the CAN bus (should be about 60 ohms)
Related codes
Error U0081 by Vehicle Brand
FAQ
What does the U0081 code mean?
U0081 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus F Performance
What causes a U0081 error code?
The most common causes of U0081 include: Broken or damaged CAN bus wires; Short circuit in CAN circuit; Fault in one of the modules connected to the bus; Problems with module power supply.
How do I fix a U0081 diagnostic trouble code?
To fix U0081: Check the integrity of the CAN bus wiring. Inspect connectors for corrosion or damage. Check the power supply of all modules connected to the bus. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0081?
Limited driving only, diagnose soon
How much does it cost to fix U0081?
The estimated repair cost for U0081 is $6–111. Actual cost depends on your vehicle, location, and labor rates.
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