AutoCodes – Generic – U1347

U1347 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 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 1,644

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

What does this mean?

What are the Possible Causes of the DTC U1347?

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?

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 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.

Need more information about the U1347 code?

Need more information on how to fix the U1347 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1347 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1347 Buick — Engine Control Module LIN Bus 3
U1347 Cadillac — Engine Control Module LIN Bus 3
U1347 Chevrolet — Engine Control Module LIN Bus 3
U1347 GMC — Engine Control Module LIN Bus 3

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 Code

1. What are common symptoms of OBDII code U1347 (Engine Control Module LIN Bus 3)?

- Common symptoms include the check engine light coming on, issues with engine performance, and possible communication problems with other control modules.

2. What are some possible causes of OBDII code U1347?

- Causes can include a faulty Engine Control Module (ECM), issues with the LIN Bus communication network, damaged wiring, or a defective sensor.

3. How can I diagnose the cause of OBDII code U1347?

- Diagnosing the code typically involves using a diagnostic scanner to read the codes and perform further testing to pinpoint the exact cause, such as checking the wiring, connectors, and sensors related to the LIN Bus 3 network.

4. Can OBDII code U1347 be fixed by resetting the ECM?

- While resetting the ECM may temporarily clear the code, it is important to address the root cause of the issue to prevent the code from reappearing.

5. Is it safe to continue driving with OBDII code U1347 present?

- It is not recommended to continue driving with this code present, as it can affect engine performance and lead to potential safety issues. It is best to address the problem promptly.

6. Are there any DIY repair tips for resolving OBDII code U1347?

- DIY repair tips may include checking for loose or damaged wiring, ensuring all connectors are securely attached, and inspecting related components for any visible signs of damage.

7. Can a mechanic easily fix OBDII code U1347?

- A qualified mechanic with diagnostic tools and expertise in automotive electronics should be able to diagnose and repair the issue related to code U1347 effectively.

8. How much does it typically cost to repair OBDII code U1347?

- The cost of repair can vary depending on the exact cause of the code, parts needed for replacement, and labor costs. It is advisable to get a few quotes from different mechanics for an accurate estimate.

9. Will OBDII code U1347 affect my vehicle's fuel efficiency?

- Yes, unresolved issues related to code U1347 can impact fuel efficiency as it may lead to improper engine functioning and performance.

10. Can severe weather conditions cause OBDII code U1347 to trigger?

- While severe weather conditions may not directly cause the code, extreme temperatures or moisture can potentially exacerbate existing issues with the LIN Bus communication network, leading to the code being triggered.