U0014

Medium Speed CAN Communication Bus (+) High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Unstable operation of various vehicle systems
The Check Engine light comes on
Problems with electronic systems (climate control, audio system, etc.)
Floating engine speed
Loss of communication with some control units

Causes

Open or short circuit in the positive line of the CAN bus
Wiring harness damage
Corrosion of contacts in CAN bus connectors
Malfunction of one of the modules connected to the CAN bus
Problems with the control unit

How to Fix

Check the integrity of the CAN bus wiring
Look for signs of a short to positive
Check the condition of connectors and contacts
Diagnose modules connected to the problematic bus
If necessary, replace damaged wires or connectors

Related codes

U0010 U0011 U0013