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U1147 Pontiac Code - Lost Communication With Onstar

Quick Answer

The U1147 diagnostic trouble code (DTC) for Pontiac vehicles indicates that there has been a loss of communication with the OnStar system. Common causes include Faulty wiring or connectors between the PCM and OnStar module, Defective OnStar module, Software glitches in the vehicle's onboard computer. 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
U1147 Pontiac indicates Lost Communication With Onstar.
Common causes
Common causes include Faulty wiring or connectors between the PCM and OnStar module, Defective OnStar module, Software glitches in the vehicle's onboard computer.
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 15, 2024
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Code U1147 Pontiac Description

The U1147 diagnostic trouble code (DTC) for Pontiac vehicles indicates that there has been a loss of communication with the OnStar system. OnStar is a subscription-based service that provides various features such as emergency assistance, vehicle diagnostics, navigation, and more. When this code is triggered, it means that the vehicle's onboard computer is unable to communicate with the OnStar system, which can have several implications for the vehicle's performance and functionality.

OBDII Code U1147 Pontiac - Lost Communication With Onstar
U1147 Pontiac Code - Lost Communication With Onstar

Common Causes of U1147 Pontiac

  1. Faulty wiring or connectors between the PCM and OnStar module
  2. Defective OnStar module
  3. Software glitches in the vehicle's onboard computer
  4. Electrical issues such as a blown fuse affecting communication
  5. Physical damage to wiring harnesses or connectors

Symptoms of U1147 Pontiac

  1. OnStar services not functioning properly
  2. Loss of emergency assistance capabilities
  3. Navigation system errors or malfunctions
  4. Warning light on the dashboard indicating a communication issue

How to Fix U1147 Pontiac

  1. Begin by conducting a thorough inspection of the wiring harnesses and connectors between the PCM and OnStar module. Look for any signs of damage, corrosion, or loose connections.
  2. Use a diagnostic scan tool to check for any stored trouble codes in the vehicle's computer system. Clear the codes and see if the U1147 code returns.
  3. If the issue persists, consider testing the OnStar module itself for functionality. This may involve checking for power and ground connections, as well as verifying that the module is communicating properly with the vehicle's network.
  4. If no issues are found with the wiring, connectors, or OnStar module, it may be necessary to update the vehicle's software to address any communication glitches.
  5. Once the root cause of the communication loss is identified and resolved, clear the trouble codes and test the vehicle to ensure that the OnStar system is functioning correctly.

Cost to Fix U1147 Pontiac

The typical repair costs for addressing a U1147 code can vary depending on the specific cause of the communication loss. In general, the cost of parts such as wiring harnesses, connectors, or an OnStar module replacement can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair time can vary depending on the complexity of the issue. Therefore, the total cost of addressing a U1147 code may range from $200 to $1000 or more, depending on the specific circumstances. It is advisable to consult with a qualified mechanic or dealership to get a more accurate estimate based on the vehicle's make and model, as well as the extent of the repair needed.

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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 U1147 Pontiac Code

1. What are the common symptoms of OBDII code U1147 in a Pontiac indicating lost communication with Onstar?

- Common symptoms include the Onstar system not functioning properly, loss of communication with the Onstar module, and potential issues with other vehicle systems linked to Onstar.

2. What could be the main causes of the U1147 code in a Pontiac?

- The U1147 code typically indicates a communication error between the vehicle's onboard diagnostic system and the Onstar module. This can be caused by a faulty Onstar module, wiring issues, or a problem with the vehicle's computer system.

3. How can I diagnose the U1147 code in my Pontiac?

- Diagnosis involves using an OBDII scanner to read the code, checking the Onstar module for any visible damage, inspecting the wiring connections, and testing the vehicle's communication systems.

4. Is it safe to drive my Pontiac with the U1147 code present?

- It is generally safe to drive the vehicle with the U1147 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure proper functioning of the Onstar system and other related systems.

5. Can I repair the U1147 code in my Pontiac on my own?

- Depending on your skill level and access to tools, you may be able to address the U1147 code by checking and repairing any loose connections, replacing damaged wiring, or replacing the Onstar module if necessary. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any quick fixes for the U1147 code in a Pontiac?

- Quick fixes may include checking and tightening any loose connections related to the Onstar system, ensuring the Onstar module is securely in place, and resetting the vehicle's computer system to clear the code temporarily.

7. Will the U1147 code cause any other issues in my Pontiac?

- While the U1147 code itself may not directly cause other issues, it can lead to the loss of important features provided by the Onstar system, such as emergency assistance, vehicle diagnostics, and remote services.

8. How much does it typically cost to repair the U1147 code in a Pontiac?

- The cost of repairing the U1147 code can vary depending on the specific cause of the communication error. It may involve simple fixes like reconnecting wires or more complex repairs like replacing the Onstar module, with costs ranging from a few hundred to over a thousand dollars.

9. Can the U1147 code be triggered intermittently in a Pontiac?

- Yes, the U1147 code can be triggered intermittently due to loose connections, temporary communication errors, or environmental factors affecting the Onstar system. It is important to address the issue promptly to prevent recurring problems.

10. How can I prevent the U1147 code from reoccurring in my Pontiac?

- To prevent the U1147 code from reoccurring, regularly inspect the Onstar system components for damage or wear, ensure proper wiring connections, and keep the vehicle's communication systems well-maintained.

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