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Engine-Codes – GMC – U1347 GMC

U1347 GMC Code - Engine Control Module LIN Bus 3

Quick Answer

The U1347 GMC code indicates a problem with the Engine Control Module (ECM) LIN Bus 3. Common causes include Faulty wiring or connectors in the LIN Bus network, Malfunctioning ECM, Issues with other modules connected to the LIN Bus. 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
U1347 GMC indicates Engine Control Module LIN Bus 3.
Common causes
Common causes include Faulty wiring or connectors in the LIN Bus network, Malfunctioning ECM, Issues with other modules connected to the LIN Bus.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code U1347 GMC Description

The U1347 GMC code indicates a problem with the Engine Control Module (ECM) LIN Bus 3. The LIN Bus is a communication network that allows various modules in the vehicle to communicate with each other. In this case, the ECM, which is responsible for controlling the engine's operation, is experiencing communication issues on Bus 3. This can lead to a variety of performance problems and potentially affect multiple systems within the vehicle.

OBDII Code U1347 GMC - Engine Control Module LIN Bus 3
U1347 GMC Code - Engine Control Module LIN Bus 3

Common Causes of U1347 GMC

  1. Faulty wiring or connectors in the LIN Bus network
  2. Malfunctioning ECM
  3. Issues with other modules connected to the LIN Bus
  4. Electrical interference or shorts in the system
  5. Software glitches or programming errors

Symptoms of U1347 GMC

  1. Engine misfires or rough idling
  2. Reduced power and acceleration
  3. Check Engine Light illuminated
  4. Poor fuel efficiency
  5. Vehicle stalling or difficulty starting

How to Fix U1347 GMC

  1. Perform a thorough diagnostic scan to identify the specific cause of the U1347 code.
  2. Inspect the wiring and connectors associated with the LIN Bus for any damage or corrosion.
  3. Test the ECM and other modules connected to the LIN Bus for proper functionality.
  4. Repair or replace any faulty components identified during testing.
  5. Clear the code, reset the ECM, and perform a test drive to ensure the issue has been resolved.

Cost to Fix U1347 GMC

The cost of repairing the U1347 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary significantly. It's recommended to contact local shops for accurate estimates based on your vehicle's make and model, as well as your location.

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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 U1347 GMC Code

1. What are common symptoms of OBDII code U1347 in a GMC related to the Engine Control Module LIN Bus 3?

- Common symptoms include issues with engine starting, rough idling, poor acceleration, and potential communication errors with other vehicle modules.

2. What are some possible causes of OBDII code U1347 GMC indicating a problem with the Engine Control Module LIN Bus 3?

- Potential causes include damaged wiring or connectors in the LIN bus circuit, a faulty Engine Control Module (ECM), or issues with other control modules connected to the LIN bus network.

3. How can I diagnose OBDII code U1347 in my GMC related to the Engine Control Module LIN Bus 3?

- Diagnosing this code typically involves using a scan tool to check for communication errors between the ECM and other modules, inspecting the LIN bus wiring for damage, and testing the ECM for proper functionality.

4. Can I still drive my GMC if the OBDII code U1347 related to the Engine Control Module LIN Bus 3 is present?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to potential performance issues and further damage to the vehicle's electronic systems.

5. Are there any DIY repair tips for fixing OBDII code U1347 GMC indicating a problem with the Engine Control Module LIN Bus 3?

- DIY repair tips may include checking and repairing damaged wiring, ensuring proper connections in the LIN bus network, and resetting the ECM to see if the code clears.

6. How serious is OBDII code U1347 in a GMC related to the Engine Control Module LIN Bus 3?

- This code should be addressed promptly as it can affect the vehicle's performance and overall functionality. Ignoring the issue may lead to more severe electrical problems.

7. Can a damaged LIN bus affect other systems in the vehicle besides the Engine Control Module?

- Yes, a damaged LIN bus can potentially affect communication with other control modules in the vehicle, leading to issues with various systems such as transmission control, ABS, or airbag systems.

8. Will resetting the ECM clear the OBDII code U1347 related to the Engine Control Module LIN Bus 3?

- Resetting the ECM may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear after driving the vehicle for some time.

9. Is it necessary to visit a dealership or mechanic to diagnose and repair OBDII code U1347 GMC involving the Engine Control Module LIN Bus 3?

- While advanced diagnostics may require specialized tools, some basic checks like inspecting wiring can be done by DIY enthusiasts. However, for a thorough diagnosis and proper repair, it's advisable to consult a professional mechanic.

10. How much can I expect to pay for repairing OBDII code U1347 related to the Engine Control Module LIN Bus 3 in a GMC?

- Repair costs can vary depending on the exact cause of the issue. It is recommended to get a diagnostic done to determine the specific problem and associated repair costs.

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