U0181
Lost Communication With Headlamp Leveling Control Module A
U0181 is an OBD-II diagnostic trouble code meaning: Lost Communication With Headlamp Leveling Control Module A. Common causes: open or short circuit in the headlight level module circuit, malfunction of the headlight leveling module. Estimated repair cost: $17–89.
Symptoms
- Error message on the dashboard
- Inability to adjust headlight levels
- Headlights only work in one position
- Flashing or unstable headlights
Causes
- Open or short circuit in the headlight level module circuit
- Malfunction of the headlight leveling module
- Problems with the CAN bus
- Vehicle control unit malfunction
- Poor contact in connectors
How to Fix
- Check the headlight level module fuse
- Inspect the wiring harness for damage
- Check headlight level module connectors
- Scan the CAN bus for errors
- Replace headlight level module if necessary
Related codes
Error U0181 by Vehicle Brand
FAQ
What does the U0181 code mean?
U0181 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Headlamp Leveling Control Module A
What causes a U0181 error code?
The most common causes of U0181 include: Open or short circuit in the headlight level module circuit; Malfunction of the headlight leveling module; Problems with the CAN bus; Vehicle control unit malfunction.
How do I fix a U0181 diagnostic trouble code?
To fix U0181: Check the headlight level module fuse. Inspect the wiring harness for damage. Check headlight level module connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0181?
Do not drive — repair immediately
How much does it cost to fix U0181?
The estimated repair cost for U0181 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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