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Engine-Codes – GMC – U1522 GMC

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

Quick Answer

The U1522 GMC code indicates that there is a communication issue 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 wiring connections, Water or moisture damage to headlamp components. 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 GMC 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 wiring connections, Water or moisture damage to headlamp components.
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 11, 2024
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Code U1522 GMC Description

The U1522 GMC code indicates that there is a communication issue 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 vehicles to allow various modules to communicate with each other. In this case, the loss of communication with the right headlamp can lead to various issues related to headlamp functionality.

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

Common Causes of U1522 GMC

  1. Faulty Headlamp Control Module or Headlamp Leveling Control Module
  2. Loose or corroded wiring connections
  3. Water or moisture damage to headlamp components
  4. Electrical short circuit in the LIN bus network
  5. Software glitch or communication error within the vehicle's system

Symptoms of U1522 GMC

  1. Right headlamp not turning on or functioning erratically
  2. Headlamp leveling not adjusting properly
  3. Dashboard warning light related to headlamp system
  4. Loss of automatic headlamp control features

How to Fix U1522 GMC

  1. Perform a visual inspection of the headlamp components and wiring connections to check for any obvious issues such as loose connections or water damage.
  2. Use a diagnostic scan tool to communicate with the Headlamp Control Module and check for any stored fault codes or communication errors.
  3. Test the functionality of the right headlamp and headlamp leveling system to determine if the issue lies with the module or another component.
  4. If a faulty module is identified, replace the Headlamp Control Module or Headlamp Leveling Control Module as needed.
  5. Clear the fault codes and reset the system to ensure proper communication and functionality.

Cost to Fix U1522 GMC

The typical repair costs for addressing a U1522 GMC code can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a Headlamp Control Module or Headlamp Leveling Control Module can range from $200 to $500, including parts and labor. Additional diagnostic time and labor rates may apply, with hourly rates typically ranging from $80 to $150. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate cost estimate based on the vehicle's make and model.

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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 GMC Code

1. What are common symptoms of the U1522 GMC OBDII code?

- Common symptoms include the right headlamp not functioning properly, uneven headlight beam pattern, and dashboard warning light illuminating.

2. What can cause the U1522 GMC code to appear?

- The code is typically triggered when there is a communication loss between the headlamp control module and the right headlamp on the LIN bus network.

3. How can I diagnose the U1522 GMC code?

- To diagnose the code, you can use a diagnostic scanner to retrieve the specific error code and check the connections between the headlamp control module and the right headlamp.

4. What are some repair tips for resolving the U1522 GMC code?

- Start by checking the wiring connections between the headlamp control module and the right headlamp for any loose connections or damage. Resetting the module or replacing it may also be necessary.

5. Can I drive my vehicle with the U1522 GMC code present?

- It is not recommended to drive with the U1522 code present, as it can affect the functionality of your right headlamp, posing a safety risk while driving at night.

6. Is the U1522 GMC code a serious issue?

- While the code itself may not indicate a critical mechanical problem, it should be addressed promptly to ensure proper functioning of the headlamp system and overall safety of the vehicle.

7. How much does it typically cost to repair the U1522 GMC code?

- The cost of repairs for the U1522 code can vary depending on the extent of the issue and whether it requires simple troubleshooting or replacement of components. It is recommended to consult a professional for an accurate estimate.

8. Can the U1522 GMC code be triggered by a faulty headlamp bulb?

- While a faulty headlamp bulb can cause headlight issues, the U1522 code specifically relates to communication problems between the headlamp control module and the right headlamp on the LIN bus network.

9. Are there any preventive measures to avoid the U1522 GMC code from reoccurring?

- Regularly inspecting the headlamp system, ensuring proper connections, and addressing any electrical issues promptly can help prevent the U1522 code from reoccurring in the future.

10. Can I reset the U1522 GMC code myself?

- You can attempt to reset the code using an OBDII scanner, but it is recommended to address the underlying issue causing the code to prevent it from reoccurring. If the problem persists, seek professional assistance.

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