AutoCodes – Buick – U1347 Buick

U1347 Buick Code - Engine Control Module LIN Bus 3

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 Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, Control Module 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: U1347 Buick indicates Engine Control Module LIN Bus 3.
Common causes: Common causes include Faulty Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, Control Module 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 417

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 May 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1347 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) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1347 Buick - Engine Control Module LIN Bus 3 - AutoCodes.com — U1347 Buick Code - Engine Control Module LIN Bus 3

What does this mean?

What are the Possible Causes of the DTC U1347 Buick?

Faulty Control Module Setting the Diagnostic Trouble Code (DTC)
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U1347 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 U1347 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 U1347 Buick Code

1. What does the OBDII code U1347 mean on a Buick?

The U1347 code indicates an issue with the Engine Control Module (ECM) related to the LIN Bus 3 communication, which is a serial data network used to connect various vehicle components.

2. What are the common symptoms of the U1347 code on a Buick?

Symptoms may include warning lights on the dashboard, reduced engine performance, intermittent electrical issues, or failure of components connected to the LIN Bus 3.

3. What causes the U1347 code to appear on a Buick?

Common causes include damaged or corroded wiring, a malfunctioning control module, a short or open circuit in the LIN Bus 3, or a software issue in the ECM.

4. How can I diagnose the U1347 code on my Buick?

Start by using a diagnostic scanner to confirm the code. Inspect the wiring and connectors related to the LIN Bus 3, check for physical damage or corrosion, and test the ECM for proper communication signals.

5. Is the U1347 code serious on a Buick?

While the U1347 code may not immediately disable your vehicle, it can lead to performance issues and potentially cause further damage if not addressed promptly.

6. Can a software update fix the U1347 code on a Buick?

In some cases, a software update for the ECM may resolve the issue. Check with a dealership or qualified technician to see if your vehicle has any available software updates.

7. What components should I check when troubleshooting the U1347 code?

Inspect the LIN Bus 3 wiring, connectors, and related components, such as sensors or actuators, that communicate with the ECM via the LIN Bus.

8. Can I drive my Buick with the U1347 code active?

You may be able to drive the vehicle, but it is not recommended, as the issue could worsen and lead to further system malfunctions.

9. How much does it typically cost to repair the U1347 code on a Buick?

Repair costs can vary depending on the cause, but diagnosing and fixing wiring issues or replacing a faulty module can range from $200 to $1,000 or more.

10. Do I need a professional to fix the U1347 code on my Buick?

If you're experienced with automotive diagnostics, you can attempt basic checks, but resolving the issue often requires specialized tools and expertise, so consulting a professional is recommended.