U0180
Lost Communication With Automatic Lighting Control Module
Communication network (lighting)
Generic OBD-II
Low
What it means
U0180 means the network has lost communication with the automatic lighting control module — the unit that runs features like automatic headlights, daytime running lights, and auto high-beam. Basic lighting usually still works manually, so the main effect is loss of automatic operation. It's typically a power, ground, or bus wiring problem at the module.
Low
Can I keep driving? Drivable — you may lose automatic headlight features, and basic lighting usually still works manually. Confirm your lights work at night and get it fixed.
Common symptoms
What you'll notice
- Automatic headlights not switching on or off as expected
- Warning light or message about the lighting system
- Automatic lighting control module not responding to a scan tool
- Features like auto high-beam or daytime running lights inoperative
Common causes
Most likely first
- Loss of power or ground to the automatic lighting control moduleLikely
- Blown fuse feeding the moduleCommon
- Corroded, damaged, or loose connectors and wiringCommon
- CAN bus wiring fault isolating the module from the networkLess often
- Failed automatic lighting control moduleLess often
How to diagnose & fix
Work through it in order
- Scan all modules and confirm the automatic lighting control module is unreachable.
- Check battery voltage and the module's fuse, power, and ground feeds first.
- Inspect the module's connectors and wiring for corrosion, damage, or water intrusion.
- Test the CAN bus wiring between the module and the network for opens or shorts.
- If power, grounds, and wiring are good, suspect the module — replace and program it as required, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with U0180?+
Usually yes, but automatic lighting may not work, so verify your headlights operate manually — especially at night — and get it fixed.
Can I just clear U0180?+
You can, but it returns unless the module's power, ground, wiring, or the unit itself is repaired.
Related codes
Often seen with U0180
Read & clear U0180 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX