AutoCodes – Buick – U1343 Buick

U1343 Buick 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 Buick 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 578

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U1343 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 U1343 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 U1343 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.

Need more information about the U1343 Buick code?

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

Need Help with the Code?

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

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 Buick Code

What does the OBDII code U1343 mean on a Buick?

1. The U1343 code indicates a communication issue on LIN Bus 1 between the Chassis Control Module (CCM) and other related components. 2.

What are common symptoms of the U1343 code?

Symptoms may include illuminated warning lights (such as the ABS or traction control light), loss of communication with certain modules, or issues with vehicle stability and handling systems. 3.

What causes the U1343 code to appear?

The most common causes include a faulty Chassis Control Module, damaged LIN Bus wiring, poor electrical connections, or a malfunctioning LIN Bus component. 4.

How can I diagnose a U1343 code?

Start by scanning for codes using an OBDII scanner, then inspect the LIN Bus 1 wiring and connections for damage or corrosion. Check the functionality of related components and modules. 5.

Can a blown fuse trigger the U1343 code?

Yes, a blown fuse in the circuit related to the Chassis Control Module or LIN Bus 1 can cause this code to appear. 6.

How do I fix the U1343 code?

Repairs may involve replacing damaged wiring, cleaning corroded connectors, repairing or replacing the Chassis Control Module, or addressing issues with other LIN Bus components. 7.

Is it safe to drive with a U1343 code on a Buick?

It may be unsafe to drive, as the code could impact systems like traction control and stability, which are critical for handling and braking. 8.

How much does it cost to repair a U1343 code?

Repair costs can vary depending on the root cause but typically range from $100 to $600, depending on whether wiring, connectors, or modules need to be replaced. 9.

Can a low battery cause the U1343 code?

Yes, a weak or low battery can lead to communication errors on the LIN Bus and trigger the U1343 code. 10.

Do I need special tools to fix the U1343 code?

While basic tools can help inspect wiring and connectors, an advanced diagnostic scanner capable of reading LIN Bus data may be required for accurate troubleshooting.