U0275: Lost Communication With Lighting Driver Control Module C

What it means

The vehicle bus reports loss of communication with lighting driver control module C. 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 C controls the lighting functions assigned to it, potentially including LED matrix segments and adaptive headlamp operation. Other modules expect messages from Module C on the vehicle bus, and this code sets when those messages disappear.

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 all modules and save communication codes and freeze-frame data to check whether Module C alone is missing or the bus has wider faults.
2. Check the functions assigned to Module C for inoperative lighting, a fallback beam pattern, or related warnings.
3. Inspect Module C's connector and nearby bus wiring for looseness, corrosion, water entry, or physical damage.
4. Verify Module C's power and ground using the manufacturer's test conditions.
5. Test the bus wiring to Module C for opens or shorts according to the manufacturer's procedure before condemning the module.

Common fixes

• Secure or clean Module C's connector if it is loose or corroded.
• Repair damaged bus wiring to Module C.
• Restore Module C's power or ground supply.
• Replace Module C if its supplies and bus wiring pass checks but it remains offline.

Can I keep driving?

Do not drive at night if the lighting functions assigned to Module C are missing or the beam is limited. Reduced or misdirected headlamp output can make it harder to see and can affect other road users.