U0056

Vehicle Communication Bus D Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

Unstable operation of secondary vehicle systems
Other errors related to the CAN bus appear
Problems with climate control or audio system
Flashing indicators on the dashboard

Causes

Damage to CAN D bus wiring
Fault in one of the modules connected to the bus
Problems with module power supply
Corrosion or oxidation of contacts
Mechanical damage to the wiring harness

How to Fix

Check the integrity of the CAN D bus wiring
Check connections and contacts of all modules on the bus
Check the power supply of the modules connected to the bus
Scan all modules for errors
Replace damaged components if necessary

Related codes

U0055 U0057 U0058