U0086
Vehicle Communication Bus F - Low
U0086 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus F - Low. Common causes: open or short circuit in the communication bus circuit f, poor contact in can bus connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Incorrect operation of the vehicle's electronic systems
- Loss of communication between control modules
- Problems with diagnostics via OBD-II connector
- Dashboard malfunctions
Causes
- Open or short circuit in the communication bus circuit F
- Poor contact in CAN bus connectors
- Fault in one of the modules connected to the bus
- Wiring harness damage
- Problems with power supply to communication modules
How to Fix
- Check the integrity of the communication bus wiring F
- Inspect and clean the contacts in the CAN bus connectors
- Check power and ground of communication modules
- Disable the modules one by one to identify the faulty one.
- Check the resistance and integrity of the bus terminators
Related codes
Error U0086 by Vehicle Brand
FAQ
What does the U0086 code mean?
U0086 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus F - Low
What causes a U0086 error code?
The most common causes of U0086 include: Open or short circuit in the communication bus circuit F; Poor contact in CAN bus connectors; Fault in one of the modules connected to the bus; Wiring harness damage.
How do I fix a U0086 diagnostic trouble code?
To fix U0086: Check the integrity of the communication bus wiring F. Inspect and clean the contacts in the CAN bus connectors. Check power and ground of communication modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0086?
Yes, but get it checked soon
How much does it cost to fix U0086?
The estimated repair cost for U0086 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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