U018A

Lost Communication With Headlamp Leveling Control Module B

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Error message on the dashboard
Automatic headlight leveling does not work
Headlights may not be aimed correctly
Flashing or unstable headlights
Warning light on instrument panel

Causes

Open or short circuit in the module power supply circuit
Damage to the wiring harness to the headlight adjustment module
Malfunction of headlight leveling module B
Connector problems or contact corrosion
Failures in the control unit software

How to Fix

Check fuses associated with the headlight system
Inspect the wiring harness and connectors of the adjustment module
Check power and ground on the headlight adjustment module
Scan the module for additional errors
If necessary, replace headlight leveling module B

Related codes

U0189 U018B U0188