U0201
NetworkModule Communicationmoderate severityLost Communication with Headlamp Control Module
What U0201 Means
Cannot communicate with the headlamp control or adaptive headlamp module.
Symptoms
- Headlights not activating
- Auto headlights disabled
- Adaptive headlights not swiveling
- DRL malfunction
Common Causes
- Headlamp module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Headlamp assembly failure
Diagnostic Steps
- Check headlamp module fuse
- Test power and ground
- Check CAN wiring
- Test headlamp assembly
- Inspect wiring at headlamp connector
Where to start: Check fuses and headlamp connector. Adaptive headlamp motors inside lamp assembly can fail.
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