AutoCodes – GMC – U1343 GMC

U1343 GMC 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 GMC 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 526

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

What does this mean?

What are the Possible Causes of the DTC U1343 GMC?

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 GMC?

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 GMC 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 GMC code?

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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 U1343 GMC Code

1. What is OBDII code U1343 GMC related to the Chassis Control Module LIN Bus 1?

The U1343 code indicates a communication problem with the Chassis Control Module LIN Bus 1 in a GMC vehicle.

2. What are common symptoms of OBDII code U1343 GMC?

Common symptoms may include issues with the stability control system, ABS system, traction control system, and potentially the vehicle's overall handling.

3. What are possible causes of OBDII code U1343 GMC?

Potential causes include a faulty chassis control module, damaged wiring or connectors in the LIN Bus network, or a communication error between modules.

4. How can I diagnose OBDII code U1343 GMC?

Diagnosis typically involves using a professional OBDII scanner to read the code, followed by inspecting the chassis control module, LIN Bus network, and related wiring for any visible damage.

5. Can I continue driving with OBDII code U1343 GMC present?

It is not recommended to drive with this code active, as it may affect the vehicle's stability control systems and impact overall safety.

6. How should I repair OBDII code U1343 GMC?

Repair options may include reprogramming the chassis control module, repairing or replacing damaged wiring or connectors, and ensuring proper communication between modules.

7. Is it possible to reset OBDII code U1343 GMC without professional help?

While you may be able to clear the code with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from recurring.

8. Can extreme weather conditions trigger OBDII code U1343 GMC?

Extreme weather conditions can potentially exacerbate existing communication issues within the LIN Bus network, leading to the activation of this fault code.

9. How much does it cost to fix OBDII code U1343 GMC?

The cost of repair can vary depending on the exact cause of the issue, but it is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.

10. How often does OBDII code U1343 GMC occur in GMC vehicles?

While not as common as some other fault codes, U1343 can still occur in GMC vehicles with certain model years and specific conditions affecting the chassis control module LIN Bus 1.