Lost Communication With Headlamp Control Module B

Where it lives

For U0242, the description names the module as the part involved.

Check these first

• Corroded wiring between headlamp control module B and the main computer
• A failed headlamp control module B
• A software fault blocking the module from communicating
• Water intrusion or collision damage at the module

What to do next

1. Confirm U0242 with a full module scan
2. Inspect the headlamp control module B harness and connector
3. Check the module for water or impact damage
4. Update the module software to the current version
5. Replace headlamp control module B if communication does not return
6. Clear the code and retest

Look up another code