U1523
Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus
U1523 is an OBD-II diagnostic trouble code meaning: Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus. Common causes: broken or damaged wiring to the left headlight, poor contact in headlight connector. Estimated repair cost: $17–167.
Symptoms
- Incorrect operation of the left headlight
- Left headlight does not respond to commands
- Error message on the dashboard
- Uneven road lighting
Causes
- Broken or damaged wiring to the left headlight
- Poor contact in headlight connector
- Left headlight malfunction
- Problems with the headlight control module
- LIN bus fault
How to Fix
- Check the integrity of the wiring to the left headlight
- Inspect and clean the contacts in the connectors
- Check the power and ground on the headlight
- Scan the LIN bus for errors
- Replace the faulty headlight or control module if necessary
Related codes
FAQ
What does the U1523 code mean?
U1523 is an OBD-II diagnostic trouble code that indicates: Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Left Headlamp On LIN Bus
What causes a U1523 error code?
The most common causes of U1523 include: Broken or damaged wiring to the left headlight; Poor contact in headlight connector; Left headlight malfunction; Problems with the headlight control module.
How do I fix a U1523 diagnostic trouble code?
To fix U1523: Check the integrity of the wiring to the left headlight. Inspect and clean the contacts in the connectors. Check the power and ground on the headlight. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1523?
Do not drive — repair immediately
How much does it cost to fix U1523?
The estimated repair cost for U1523 is $17–167. Actual cost depends on your vehicle, location, and labor rates.
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