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Engine-Codes – Generic – U1544

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

Quick Answer

The diagnostic trouble code U1544 indicates that the body control module (BCM) has lost communication with the left rear window motor on the Local Interconnect Network (LIN) bus. Common causes include Faulty left rear window motor, Wiring issues or damaged wiring harness affecting communication on the LIN bus, BCM software or hardware malfunction. 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 indicates Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus.
Common causes
Common causes include Faulty left rear window motor, Wiring issues or damaged wiring harness affecting communication on the LIN bus, BCM software or hardware malfunction.
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 U1544 Description

The diagnostic trouble code U1544 indicates that the body control module (BCM) has lost communication with the left rear window motor on the Local Interconnect Network (LIN) bus. The BCM is responsible for controlling various functions within the vehicle, including power windows. The LIN bus is a communication network that allows different modules in the vehicle to exchange data. When the BCM is unable to communicate with the left rear window motor on the LIN bus, it can lead to issues with the operation of the window.

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

Common Causes of U1544

  1. Faulty left rear window motor
  2. Wiring issues or damaged wiring harness affecting communication on the LIN bus
  3. BCM software or hardware malfunction
  4. Poor connections or corrosion in the electrical system
  5. Water intrusion or moisture affecting the electrical components

Symptoms of U1544

  1. Left rear window fails to operate or gets stuck in one position
  2. Inability to control the left rear window from the driver's side switch
  3. Error message or warning light on the instrument cluster related to the power windows
  4. Intermittent operation of the left rear window

How to Fix U1544

  1. Begin by conducting a visual inspection of the wiring harness and connectors associated with the left rear window motor and the BCM. Look for any signs of damage, corrosion, or loose connections.
  2. Use a diagnostic scan tool to retrieve the U1544 code and monitor data from the BCM and left rear window motor during operation. This can help pinpoint the source of the communication failure.
  3. Test the left rear window motor for proper function by applying direct power and ground to the motor. If the motor does not operate, it may need to be replaced.
  4. Check the LIN bus communication lines for continuity and proper voltage levels. Repair or replace any damaged wiring as needed.
  5. If the issue persists after addressing wiring and component faults, reprogram or replace the BCM to restore communication with the left rear window motor.

Cost to Fix U1544

The typical repair costs for addressing a U1544 code can vary depending on the specific cause of the issue. In general, replacing a faulty left rear window motor can cost between $150 and $300, while resolving wiring issues or repairing connectors may range from $100 to $200. If the BCM needs to be reprogrammed or replaced, the cost can be higher, potentially ranging from $300 to $600 or more. Labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. It is advisable to consult with a professional technician for a more accurate estimate based on the specific circumstances of the vehicle.

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Code U1544 Information for Specific Makes

  • U1544 Buick — Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus
  • U1544 Cadillac — Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus
  • U1544 Chevrolet — Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus
  • U1544 GMC — Body Control Module Lost Communication With Left Rear Window Motor 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 U1544 Code

1. What are the common symptoms of OBDII code U1544?

- Common symptoms include the left rear window not functioning properly, issues with the power window switch, and warning lights on the dashboard.

2. What could cause the Body Control Module to lose communication with the left rear window motor on the LIN bus?

- Possible causes include wiring issues, a faulty window motor, a malfunctioning power window switch, or a problem with the Body Control Module itself.

3. How can I diagnose the U1544 code related to the left rear window motor communication issue?

- Diagnose the code by checking the wiring connections, testing the left rear window motor, inspecting the power window switch, and scanning the Body Control Module for faults.

4. Can I still drive my vehicle with the U1544 code present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential inconvenience or safety hazards.

5. What are some repair tips for fixing the communication problem between the Body Control Module and the left rear window motor?

- Repair tips include checking and repairing any damaged wiring, replacing the faulty window motor or power window switch, and resetting the Body Control Module.

6. Is it possible to reset the Body Control Module to resolve the U1544 code?

- Yes, you can try resetting the Body Control Module by disconnecting the vehicle's battery for a few minutes and then reconnecting it to see if the code clears.

7. How much does it typically cost to repair the U1544 code related to the left rear window motor issue?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts and labor ranging from $100 to $500 or more.

8. Can a DIY enthusiast fix the U1544 code problem at home?

- DIY enthusiasts with automotive repair skills and proper tools may be able to address the issue themselves by following repair guides or consulting with professional mechanics.

9. Are there any recalls or technical service bulletins related to the U1544 code in certain vehicle models?

- It is recommended to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins addressing the U1544 code in specific vehicle models.

10. How important is it to address the U1544 code promptly?

- While the vehicle may still be operable with this code, it is important to address it promptly to ensure proper functionality of the left rear window and prevent potential electrical issues in the future.

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