U0071

Vehicle Communication Bus E (-) High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Check engine light comes on
Problems with the operation of car electronic systems
Loss of communication between control modules
Problems with the dashboard
Malfunctions of comfort functions

Causes

Open circuit in the CAN bus (-)
Short circuit to ground or power
Poor contact in connectors
Wiring harness damage
Malfunction of one of the control modules

How to Fix

Check the continuity of the CAN bus circuit (-)
Inspect connections and connectors for corrosion
Check resistance and absence of short circuits
Replace damaged wiring sections
Check operation of control modules

Related codes

U0070 U0072 U0073