Lost Communication With Headlamp Leveling Control Module A

Where it lives

For U0181, start at the module the description names.

Check these first

• A dynamic headlamp leveling control module that has stopped communicating
• An open or short in the headlamp leveling control module harness
• A poor connection at the headlamp leveling control module connector
• A fault on the GMLAN serial data circuit

What to do next

1. Read codes from the headlamp leveling control module on a scan tool
2. Confirm the module powers up with the key on
3. Inspect the module connector and serial data wiring
4. Test the GMLAN serial data circuit for open and short faults
5. Replace the headlamp leveling control module if it stays offline
6. Clear the code and retest

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