U0023

Low Speed CAN Communication Bus (+) High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–167 (est.)

Symptoms

Inoperability of some electronic systems
Check engine light comes on
Problems with the operation of the dashboard
Automatic transmission malfunctions
Lost connection with diagnostic equipment

Causes

Broken or damaged CAN bus wiring
Short circuit in the positive line of the CAN bus
Malfunction of one of the control modules
Poor contact in CAN bus connectors
Problems with power supply to control modules

How to Fix

Check the integrity of the CAN bus wiring
Scan all modules for errors
Check power supply and ground of control modules
Check CAN bus connectors and connections
Replace faulty modules if necessary

Related codes

U0024 U0022 U0001