AutoCodes – GMC – U1544 GMC

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

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Left Rear Window Motor, Left Rear Window Motor harness is open or shorted, Left Rear Window Motor circuit poor electrical connection. 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 Left Rear Window Motor, Left Rear Window Motor harness is open or shorted, Left Rear Window Motor circuit poor electrical connection.
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.

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Code Popularity 474

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1544 GMC Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Body Control Module (BCM) from the Left Rear Window Motor has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U1544 GMC?

Faulty Left Rear Window Motor
Left Rear Window Motor harness is open or shorted
Left Rear Window Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC U1544 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1544 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.