U0086

Vehicle Communication Bus F - Low

Severity

🔴 High

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

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

U0087 U0085 U0100