AutoCodes – GMC – U1345 GMC

U1345 GMC Code - Engine 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: U1345 GMC indicates Engine 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 10,750

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 U1345 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 U1345 GMC - Engine Control Module LIN Bus 1 - AutoCodes.com — U1345 GMC Code - Engine Control Module LIN Bus 1

What does this mean?

What are the Possible Causes of the DTC U1345 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 U1345 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 U1345 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 U1345 GMC code?

Need more information on how to fix the U1345 GMC code? Get Access to Factory Service Manuals

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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 U1345 GMC Code

1. What does OBDII code U1345 GMC indicate?

The code U1345 for GMC refers to a problem with the Engine Control Module (ECM) LIN Bus 1 communication circuit.

2. What are common symptoms of U1345 GMC code?

Common symptoms of U1345 GMC code may include engine stalling, rough idling, poor acceleration, and in some cases, the vehicle not starting.

3. What can cause the U1345 GMC code to trigger?

The U1345 GMC code can be triggered by issues such as a faulty Engine Control Module (ECM), damaged wiring in the LIN Bus 1 circuit, or a communication error within the network.

4. How can I diagnose the U1345 GMC code?

Diagnosing the U1345 GMC code typically involves using a diagnostic scanner to retrieve the code, inspecting the LIN Bus 1 circuit for any visible damage, and testing the ECM for proper functioning.

5. Can I still drive my vehicle with the U1345 GMC code present?

It is not recommended to drive your vehicle with the U1345 GMC code present as it can cause further damage to the engine and other components. It is best to address the issue promptly.

6. How can I repair the U1345 GMC code?

Repairing the U1345 GMC code may involve repairing or replacing damaged wiring in the LIN Bus 1 circuit, checking and repairing any loose connections, or replacing the Engine Control Module (ECM) if necessary.

7. Is the U1345 GMC code a serious issue?

The U1345 GMC code should be taken seriously as it can affect the performance and drivability of your vehicle. Ignoring the code can lead to potential engine problems and safety issues.

8. Can I reset the U1345 GMC code on my own?

While you can clear the U1345 GMC code using a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it cost to fix the U1345 GMC code?

The cost of fixing the U1345 GMC code can vary depending on the root cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

10. Can a DIY enthusiast fix the U1345 GMC code?

Depending on your automotive skills and knowledge, some DIY enthusiasts may be able to diagnose and repair the U1345 GMC code. However, due to the complexity of the issue, it is recommended to seek professional help if unsure.