U0012

Medium Speed CAN Communication Bus (+) Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–33 (est.)

Symptoms

Malfunctions in the operation of various vehicle systems
Check Engine Light Is On
Lost connection with some modules
Unstable operation of the dashboard

Causes

Wire break in the positive line of the CAN bus
Connector damage or corrosion
Problems with modules connected to the CAN bus
Wiring harness fault
Power or grounding problems

How to Fix

Check the integrity of the positive line of the CAN bus
Inspect connectors and contacts for damage or corrosion
Check modules connected to the CAN bus
Check wiring harness for damage
Check power supply and grounding of modules

Related codes

U0010 U0011 U0013