U0180

Universal

Lost Communication With Automatic Lighting Control Module

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The vehicle has detected that it is not receiving expected network messages from the automatic lighting control module. Depending on the vehicle, this module helps manage automatic lighting functions. The code identifies a communication problem, not proof that the module itself has failed. Automatic lighting may be unavailable or behave unpredictably, though there may be no noticeable symptoms.

Report an error with this code

⚠️ Before You Begin (Safety First)

Before driving, check that the headlights, tail lights, and other required exterior lights work. Do not drive at night or in poor visibility if required lights are not functioning; arrange a safe repair or assistance.

Common Symptoms

  • Automatic lighting functions may not work or may behave unpredictably because the vehicle cannot receive expected messages from the control module.
  • A warning light or message may appear, depending on the vehicle.
  • Other systems that rely on messages from this module may also be affected.
  • There may be no noticeable symptoms if the affected automatic lighting function is not being used or the issue is intermittent.

Common Causes

  • A loose, damaged, or corroded connector or wiring issue affecting the module’s power or ground.
  • An open, short, or other fault in the vehicle communication wiring.
  • A blown fuse or another power supply problem for the module.
  • Low or unstable vehicle battery voltage affecting module communication.
  • A fault in the automatic lighting control module.
  • A communication problem elsewhere on the vehicle network.

Diagnostic Steps

  1. Check whether the vehicle has any lighting warnings and note when they appear; this can help identify whether the issue is constant or intermittent.
  2. With the vehicle safely parked, check that the headlights, tail lights, and other required exterior lights operate. Avoid driving if required lights do not work.
  3. Check the owner’s manual for relevant fuses and inspect them only as described there; replace a fuse only with the specified type and rating.
  4. With the vehicle off, visually inspect accessible connectors and wiring around the relevant lighting components for looseness or obvious damage. Do not pull on wiring or probe unfamiliar connectors.
  5. If the code returns or communication remains unavailable, have the vehicle scanned for related module codes and network faults before replacing parts.

When to Call a Professional

Use a scan tool that can communicate with the vehicle’s modules. Check for related communication codes and confirm the automatic lighting control module’s power, ground, connectors, and network circuits using the vehicle-specific wiring information. Diagnose the communication path before considering module replacement.

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Commonly Asked Questions

Does U0180 prove the automatic lighting control module is defective?

No. The code reports lost communication. A power, ground, connector, wiring, network, or module fault could cause that condition, so testing is needed before replacing a part.

Can the vehicle still be driven with U0180?

That depends on whether required exterior lights work and whether other vehicle functions are affected. Check the lights before driving, and do not drive at night or in poor visibility if required lights are not functioning.

Why might there be no symptoms?

The affected automatic lighting function may not be in use, or the communication interruption may be intermittent. A stored code can remain even when the problem is not currently noticeable.

What should be checked before replacing the module?

Check for related codes and verify the module’s power, ground, connectors, and communication wiring using vehicle-specific information. The exact tests depend on the vehicle.

Browse Available Code Guides

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