B3128

Left Front/Driver Door Unlock Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Problems unlocking the driver's door
Central locking doesn't work
Alarm light flashing
Error message on the dashboard

Causes

Open or short circuit in the door wiring harness
Door lock solenoid malfunction
Connector pin corrosion
Body Control Module (BCM) Problems
Mechanical damage to the wiring in the doorway

How to Fix

Check the integrity of the wiring harness in the doorway
Test the resistance of the unlocking circuit
Inspect and clean connector contacts
Check the operation of the door lock solenoid
Replace damaged wires or components as necessary
Reset the error and check the system

Related codes

B3127 B3129 B3130