AutoCodes – Buick – U1544 Buick

U1544 Buick 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 Buick 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 669

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 Buick 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 Buick - Body Control Module Lost Communication With Left Rear Window Motor On LIN Bus - AutoCodes.com — U1544 Buick 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 Buick?

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 Buick?

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 Buick 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 Buick Code

1. What are common symptoms of OBDII code U1544 in a Buick related to the Body Control Module losing communication with the left rear window motor on the LIN bus?

Symptoms may include the left rear window being unresponsive, the window moving erratically, or the window getting stuck in a certain position.

2. What are possible causes of OBDII code U1544 in a Buick indicating a communication issue between the Body Control Module and the left rear window motor on the LIN bus?

Potential causes may include a faulty window motor, a damaged LIN bus communication wire, a malfunctioning Body Control Module, or a loose electrical connection.

3. How can I diagnose the issue related to OBDII code U1544 in a Buick signaling a loss of communication with the left rear window motor on the LIN bus?

Diagnosis typically involves checking the wiring harness for any damage, testing the window motor for proper functionality, inspecting the LIN bus connections, and using a scan tool to communicate with the Body Control Module.

4. Can a DIY enthusiast repair OBDII code U1544 in a Buick associated with the Body Control Module losing communication with the left rear window motor on the LIN bus?

Repairing this issue may require advanced diagnostic tools and knowledge of automotive electrical systems. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to continue driving a Buick with OBDII code U1544 indicating a communication problem between the Body Control Module and the left rear window motor on the LIN bus?

Driving with this issue may result in the left rear window being stuck in a certain position, which can be inconvenient or pose a security risk. It is best to address the problem promptly to avoid further complications.

6. What are some tips for preventing OBDII code U1544 from occurring in a Buick due to the Body Control Module losing communication with the left rear window motor on the LIN bus?

Regularly inspecting the window motor and wiring harness for any signs of wear or damage, ensuring all electrical connections are secure, and addressing any window operation issues promptly can help prevent this code from reoccurring.

7. Can extreme weather conditions contribute to OBDII code U1544 being triggered in a Buick with a communication error between the Body Control Module and the left rear window motor on the LIN bus?

Extreme temperatures or moisture exposure can potentially affect the electrical components and connections involved in the window motor system, leading to communication issues and triggering this code.

8. How long does it typically take for a mechanic to diagnose and repair OBDII code U1544 in a Buick caused by the Body Control Module losing communication with the left rear window motor on the LIN bus?

The time required for diagnosis and repair can vary depending on the underlying cause of the issue. It is advisable to consult with a mechanic to get an accurate estimate based on the specific circumstances.

9. Are there any recalls or technical service bulletins related to OBDII code U1544 in Buick vehicles due to a communication problem between the Body Control Module and the left rear window motor on the LIN bus?

It is recommended to check with Buick dealerships or online databases for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or solutions provided by the manufacturer.

10. How much can I expect to pay for repairing OBDII code U1544 in a Buick associated with the Body Control Module losing communication with the left rear window motor on the LIN bus?

Repair costs can vary depending on the extent of the issue, parts needed, labor rates, and other factors. It is advisable to obtain multiple quotes from reputable mechanics to compare prices before proceeding with the repair.