U0066

Vehicle Communication Bus E (+) Open

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

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

U0065 U0067 U0068