AutoCodes – Generic – U1343

U1343 Code - Chassis Control Module LIN Bus 1

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: U1343 indicates Chassis Control Module LIN Bus 1.
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 1,033

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 U1343 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 U1343 - Chassis Control Module LIN Bus 1 - AutoCodes.com — U1343 Code - Chassis Control Module LIN Bus 1

What does this mean?

What are the Possible Causes of the DTC U1343?

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 U1343?

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 U1343 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 U1343 code?

Need more information on how to fix the U1343 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1343 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1343 Buick — Chassis Control Module LIN Bus 1
U1343 Cadillac — Chassis Control Module LIN Bus 1
U1343 Chevrolet — Chassis Control Module LIN Bus 1
U1343 GMC — Chassis Control Module LIN Bus 1

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 U1343 Code

1. What does OBDII code U1343 mean?

The U1343 code indicates a malfunction in the Chassis Control Module LIN Bus 1 communication circuit.

2. What are the common symptoms of a U1343 code?

Common symptoms of a U1343 code may include issues with the stability control system, traction control system, and brake assist features.

3. What are the possible causes of a U1343 code?

Possible causes of a U1343 code include damaged wiring, loose connections, a faulty chassis control module, or a malfunction in the LIN Bus communication network.

4. How can I diagnose a U1343 code?

Diagnosing a U1343 code involves using a diagnostic scanner to retrieve the code, inspecting the chassis control module and related wiring for visible damage, and conducting a thorough inspection of the LIN Bus network.

5. Can I drive my vehicle with a U1343 code?

It is not recommended to drive your vehicle with a U1343 code, as it may affect the proper functioning of critical safety systems like stability control and traction control.

6. How can I repair a U1343 code?

Repairing a U1343 code may involve repairing or replacing damaged wiring, ensuring secure connections, resetting the fault code, or replacing the chassis control module if necessary.

7. Will a U1343 code cause my vehicle to fail an emissions test?

A U1343 code is not directly related to emissions, but it can lead to a failed emissions test if it affects the overall performance and safety systems of the vehicle.

8. How much does it cost to fix a U1343 code?

The cost of fixing a U1343 code can vary depending on the underlying cause. It may range from a simple wiring repair to replacing the chassis control module, potentially costing a few hundred to a few thousand dollars.

9. Can a U1343 code be prevented?

Regular maintenance checks, avoiding water damage to the chassis control module, and promptly addressing any warning lights related to the stability control system can help prevent a U1343 code.

10. Is it safe to clear a U1343 code without fixing the issue?

Clearing a U1343 code without addressing the underlying problem is not recommended, as it can lead to potential safety hazards and may cause the issue to reoccur in the future.