U0070

Vehicle Communication Bus E (-) Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Unstable engine operation
Gear shifting problems
Check Engine Light Is On
Failure of some vehicle systems
Dashboard malfunctions

Causes

Open or short circuit in the CAN bus
Poor contact in CAN bus connectors
Malfunction of one of the ECUs
Interference in the electrical system
Wiring harness damage

How to Fix

Check the integrity of the CAN bus
Inspect and clean all CAN bus connectors
Check power and ground of all ECUs
Diagnose each ECU for faults
Replace damaged wires or connectors

Related codes

U0071 U0072 U0073