U0276: Lost Communication With Lighting Driver Control Module D

What it means

The vehicle bus reports loss of communication with lighting driver control module D. LED matrix segments and adaptive headlamp functions driven by this node may default to a fallback beam pattern.

How it works

Lighting Driver Control Module D manages its assigned lighting functions, which may include LED matrix segments and adaptive headlamp features. The vehicle bus expects Module D to send status messages; this code sets when those messages are lost.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan every available module and note communication codes and freeze-frame data to determine whether Module D or multiple bus nodes are affected.
2. Check Module D's assigned lighting functions for a fallback beam pattern, missing segments, or warning messages.
3. Inspect Module D's connector and nearby bus wiring for damage, corrosion, moisture, or loose terminals.
4. Check Module D's power and ground against the manufacturer's procedure.
5. Test its bus wiring for an open or short using the manufacturer's procedure before deciding the module has failed.

Common fixes

• Reconnect or clean a loose or corroded Module D connector.
• Repair damaged bus wiring at Module D.
• Correct a missing power or ground supply to Module D.
• Replace Module D if its power, ground, and bus circuit test correctly but it does not communicate.

Can I keep driving?

Avoid night driving if Module D's headlamp functions are unavailable or use a restricted fallback beam. The fault can reduce visibility or cause the beam to disturb other drivers.