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Engine-Codes – Generic – U1522

U1522 Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

Quick Answer

The U1522 diagnostic trouble code (DTC) indicates that there is a communication problem between the Headlamp Control Module (HCM) or Headlamp Leveling Control Module (HLCM) and the right headlamp on the LIN bus network. Common causes include Faulty Headlamp Control Module or Headlamp Leveling Control Module, Loose or corroded electrical connections in the headlamp circuit, Wiring harness damage or chafing leading to communication loss. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U1522 indicates Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus.
Common causes
Common causes include Faulty Headlamp Control Module or Headlamp Leveling Control Module, Loose or corroded electrical connections in the headlamp circuit, Wiring harness damage or chafing leading to communication loss.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code U1522 Description

The U1522 diagnostic trouble code (DTC) indicates that there is a communication problem between the Headlamp Control Module (HCM) or Headlamp Leveling Control Module (HLCM) and the right headlamp on the LIN bus network. The LIN bus is a communication network used in modern vehicles for various control modules to communicate with each other. In this case, the loss of communication with the right headlamp can lead to issues with controlling the headlamp's functions, such as leveling, aiming, or turning on/off.

OBDII Code U1522 - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
U1522 Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

Common Causes of U1522

  1. Faulty Headlamp Control Module or Headlamp Leveling Control Module
  2. Loose or corroded electrical connections in the headlamp circuit
  3. Wiring harness damage or chafing leading to communication loss
  4. Software glitch or programming error in the control module
  5. Water intrusion or moisture affecting the headlamp control components

Symptoms of U1522

  1. Right headlamp not turning on or functioning intermittently
  2. Headlamp leveling system not adjusting properly
  3. Warning message on the instrument cluster related to headlamp control
  4. Diminished visibility at night due to headlamp issues

How to Fix U1522

  1. Begin by checking for any loose or corroded electrical connections in the headlamp circuit. Clean and secure the connections as needed.
  2. Inspect the wiring harness for any damage or chafing that may be causing a communication issue. Repair or replace any damaged wiring.
  3. Scan the vehicle's computer system to diagnose the specific fault code and pinpoint the exact cause of the communication loss.
  4. If the issue lies with a faulty Headlamp Control Module or Headlamp Leveling Control Module, replace the module with a new one that is compatible with the vehicle's make and model.
  5. Clear the DTC from the vehicle's computer system and test the headlamp functionality to ensure the issue has been resolved.

Cost to Fix U1522

The typical repair costs for addressing the U1522 code can vary depending on the specific cause of the issue and the parts/labour required. On average, the cost of replacing a Headlamp Control Module or Headlamp Leveling Control Module can range from $200 to $500, including parts and labour. Additional costs may apply if there are wiring repairs or other components that need to be replaced. It's advisable to consult with a qualified mechanic or auto repair shop for an accurate estimate based on the vehicle's make and model. Keep in mind that labour rates can fluctuate based on location and shop rates, so it's recommended to research local prices for a more precise cost estimate.

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Code U1522 Information for Specific Makes

  • U1522 Buick — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
  • U1522 Cadillac — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
  • U1522 Chevrolet — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
  • U1522 GMC — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1522 Code

1. What are common symptoms of OBDII code U1522?

- Common symptoms include the right headlamp not functioning properly, headlamp leveling issues, and dashboard warning lights related to headlamp control.

2. What can cause the OBDII code U1522 to trigger?

- This code is typically triggered when the headlamp control module or headlamp leveling control module loses communication with the right headlamp on the LIN bus network.

3. How serious is OBDII code U1522?

- While this code may not affect the drivability of the vehicle, it can impact headlamp functionality and safety, especially at night or in low visibility conditions.

4. How can I diagnose the cause of OBDII code U1522?

- Diagnosing this code often involves checking the connections and wiring related to the right headlamp, headlamp control module, and LIN bus network for any faults or issues.

5. Can I still drive my vehicle with OBDII code U1522?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper operation of the right headlamp and its leveling control, compromising visibility and safety.

6. How can I repair OBDII code U1522?

- Repairing this code may involve resetting the headlamp control module, checking and repairing any damaged wiring or connections, or replacing the headlamp control module if necessary.

7. Is it possible to clear OBDII code U1522 without fixing the issue?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the communication loss to prevent the code from reoccurring.

8. Can weather conditions affect OBDII code U1522?

- Extreme weather conditions or water exposure can potentially damage the wiring or connections related to the headlamp system, leading to the communication loss and triggering the code.

9. How much does it cost to repair OBDII code U1522?

- The cost of repair can vary depending on the extent of the issue, but it may involve labor costs for diagnosis and repair, as well as potential parts replacement if needed.

10. Can a DIY enthusiast fix OBDII code U1522 at home?

- While some basic troubleshooting steps can be taken at home, diagnosing and repairing this code may require specialized tools and knowledge, so it is recommended to consult a professional mechanic for assistance.

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