U0081

Vehicle Communication Bus F Performance

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–111 (est.)

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

U0100 U0121 U0140