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U1544 GMC Code - Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus

Quick Answer

The U1544 GMC diagnostic trouble code indicates that the Body Control Module (BCM) has lost communication with the left rear window motor on the LIN bus. Common causes include Faulty wiring harness between BCM and left rear window motor, Malfunctioning left rear window motor, Communication error within the LIN bus network. 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
U1544 GMC indicates Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus.
Common causes
Common causes include Faulty wiring harness between BCM and left rear window motor, Malfunctioning left rear window motor, Communication error within the LIN bus network.
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 14, 2024
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Code U1544 GMC Description

The U1544 GMC diagnostic trouble code indicates that the Body Control Module (BCM) has lost communication with the left rear window motor on the LIN bus. The LIN bus is a communication network used in modern vehicles to allow various modules to communicate with each other. In this case, the BCM is unable to communicate with the left rear window motor, which can lead to issues with controlling the window's operation.

OBDII Code U1544 GMC - Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus
U1544 GMC Code - Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus

Common Causes of U1544 GMC

  1. Faulty wiring harness between BCM and left rear window motor.
  2. Malfunctioning left rear window motor.
  3. Communication error within the LIN bus network.
  4. Defective BCM.
  5. Corrosion or poor connections in the electrical system.

Symptoms of U1544 GMC

  1. Left rear window not responding to switch commands.
  2. Window stuck in a partially open or closed position.
  3. Inability to control the left rear window from the driver's seat.
  4. Warning light on the dashboard related to the window system.

How to Fix U1544 GMC

  1. Begin by conducting a thorough inspection of the wiring harness connecting the BCM to the left rear window motor. Look for any signs of damage, wear, or corrosion. Repair or replace any faulty wiring as needed.
  2. Test the left rear window motor for proper operation. If the motor is found to be faulty, replace it with a new unit.
  3. Check the BCM for any signs of malfunction. If necessary, reprogram or replace the BCM to restore communication with the left rear window motor.
  4. Verify proper communication within the LIN bus network by checking for any network faults or errors. Address any issues found to ensure reliable communication between modules.
  5. Clear the U1544 GMC trouble code from the vehicle's memory using a diagnostic scan tool once the repairs have been completed.

Cost to Fix U1544 GMC

The typical repair costs for addressing the U1544 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty window motor can cost between $150 and $300, while repairing or replacing a BCM can range from $200 to $600. Labor costs can add an additional $80 to $150 per hour, with the total repair bill potentially amounting to several hundred dollars. It's advisable to consult with a qualified mechanic or auto repair shop to obtain an accurate estimate based on the vehicle's make and model, as well as the local labor rates in your area.

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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 U1544 GMC Code

1. What are the common symptoms of OBDII code U1544 in a GMC vehicle?

- Common symptoms include the left rear window not functioning, power window switch not working, and potential issues with other body control module functions.

2. What does the OBDII code U1544 GMC indicate?

- The code U1544 indicates that the body control module has lost communication with the left rear window motor on the LIN bus.

3. What are the possible causes of the Body Control Module losing communication with the left rear window motor?

- Causes may include a faulty left rear window motor, damaged wiring or connectors, a malfunctioning body control module, or a communication bus issue.

4. How can I diagnose the U1544 code related to the left rear window issue?

- Diagnosing the issue involves checking the left rear window motor, inspecting the wiring and connectors for damage, and using a diagnostic tool to communicate with the body control module.

5. Can a DIYer repair the U1544 code related to the left rear window problem?

- Repairing the issue may require advanced diagnosis and specialized tools, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Is it safe to continue driving with the U1544 code present?

- It is not recommended to continue driving with the U1544 code present, as it may affect the functionality of the left rear window and potentially other body control module functions.

7. Do I need to replace the body control module if I encounter the U1544 code?

- Replacing the body control module may be necessary if it is determined to be the cause of the communication issue with the left rear window motor, but thorough diagnosis is essential before proceeding with any repairs.

8. Are there any temporary fixes for the U1544 code related to the left rear window issue?

- Temporary fixes such as checking and securing wiring connections or resetting the body control module may help in some cases, but a permanent solution will likely require professional intervention.

9. How much does it typically cost to repair the U1544 code in a GMC vehicle?

- Repair costs for the U1544 code can vary depending on the underlying cause, but it is advisable to budget for diagnostic fees, parts replacement, and labor costs when seeking professional repair services.

10. Can the U1544 code be triggered by other issues not related to the left rear window motor?

- While the U1544 code specifically points to a communication problem with the left rear window motor, it is essential to ensure that other related systems and components are functioning properly to prevent any potential misdiagnosis.

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