AutoCodes – Generic – U1345

U1345 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 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 26,530

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

What does this mean?

What are the Possible Causes of the DTC U1345?

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?

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 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 code?

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

Need Help with the Code?

Get the U1345 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1345 Buick — Engine Control Module LIN Bus 1
U1345 Cadillac — Engine Control Module LIN Bus 1
U1345 Chevrolet — Engine Control Module LIN Bus 1
U1345 GMC — Engine 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 U1345 Code

1. What does OBDII code U1345 indicate?

The U1345 code refers to a communication problem within the Engine Control Module LIN Bus 1.

2. What are common symptoms of OBDII code U1345?

Common symptoms include engine misfires, rough idling, poor fuel efficiency, and sometimes the vehicle may not start.

3. What are possible causes of OBDII code U1345?

Possible causes include damaged wiring or connectors in the LIN Bus circuit, a faulty Engine Control Module (ECM), or issues with other control modules communicating on the LIN Bus network.

4. How can I diagnose OBDII code U1345?

Diagnosis involves using a diagnostic scanner to retrieve the code, checking the LIN Bus circuit for continuity and proper voltage, and inspecting the ECM and other control modules for faults.

5. Can I drive my vehicle with OBDII code U1345?

It is not recommended to drive the vehicle with this code present, as it can cause further damage or safety hazards due to potential communication issues affecting engine performance.

6. How can I repair OBDII code U1345?

Repair methods may include repairing or replacing damaged wiring or connectors in the LIN Bus circuit, resetting the ECM, or replacing the ECM if it is found to be faulty.

7. Can a DIY enthusiast fix OBDII code U1345?

While some basic diagnostic steps can be taken by a DIY enthusiast, resolving the U1345 code may require specialized tools and expertise, so it is advisable to consult a professional mechanic.

8. How much does it cost to fix OBDII code U1345?

The cost of fixing the U1345 code can vary depending on the root cause of the issue, the extent of the repairs needed, and labor rates in your area. It's best to get a diagnostic assessment from a mechanic for an accurate cost estimate.

9. What happens if I ignore OBDII code U1345?

Ignoring the U1345 code can lead to poor engine performance, potential stalling or starting issues, and may trigger other related trouble codes over time.

10. Can a faulty sensor trigger OBDII code U1345?

While a faulty sensor may not directly trigger U1345, it can contribute to communication issues within the LIN Bus network, which can lead to the code being generated.