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Engine-Codes – GMC – U184B 2016 GMC Sierra

U184B 2016 GMC Sierra Code - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus

Quick Answer

The diagnostic trouble code U184B for a 2016 GMC Sierra indicates that there is a communication issue with the Remote Heater and Air Conditioning Control Module on the Low Speed CAN Bus. Common causes include Faulty Remote Heater and Air Conditioning Control Module, Wiring issues or loose connections in the CAN bus network, Software malfunction in the control module. 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
U184B 2016 GMC Sierra indicates Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus.
Common causes
Common causes include Faulty Remote Heater and Air Conditioning Control Module, Wiring issues or loose connections in the CAN bus network, Software malfunction in the control module.
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 13, 2024
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Code U184B 2016 GMC Sierra Description

The diagnostic trouble code U184B for a 2016 GMC Sierra indicates that there is a communication issue with the Remote Heater and Air Conditioning Control Module on the Low Speed CAN Bus. The Low Speed CAN Bus is a communication network within the vehicle that allows various modules to exchange information. In this case, the control module responsible for managing the heater and air conditioning systems is not communicating properly, which can lead to a loss of control over these essential functions.

OBDII Code U184B 2016 GMC Sierra - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
U184B 2016 GMC Sierra Code - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus

Common Causes of U184B 2016 GMC Sierra

  1. Faulty Remote Heater and Air Conditioning Control Module.
  2. Wiring issues or loose connections in the CAN bus network.
  3. Software malfunction in the control module.
  4. Electrical interference affecting communication on the Low Speed CAN Bus.
  5. Water damage or corrosion in the control module or wiring.

Symptoms of U184B 2016 GMC Sierra

  1. Inconsistent heating or cooling in the vehicle.
  2. Inability to adjust the temperature settings on the HVAC system.
  3. Air conditioning or heating system not responding to controls.
  4. HVAC system blowing air at incorrect temperatures.
  5. Error message on the vehicle's display related to the HVAC system.

How to Fix U184B 2016 GMC Sierra

  1. Perform a diagnostic scan to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the wiring and connections in the Low Speed CAN Bus network for any damage or loose connections.
  3. Test the Remote Heater and Air Conditioning Control Module for proper functionality.
  4. Repair or replace any damaged wiring or components as needed.
  5. Clear the trouble codes and perform a final test to ensure proper communication and functionality of the HVAC system.

Cost to Fix U184B 2016 GMC Sierra

The typical repair costs for addressing a lost communication issue with the Remote Heater and Air Conditioning Control Module on a 2016 GMC Sierra can vary depending on the exact cause of the problem. In general, the cost of parts for this repair can range from $200 to $500, while labor costs can add an additional $100 to $300 to the total. This estimate does not include diagnostic time, which can vary depending on the shop's rates and the complexity of the issue.

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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 U184B 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code U184B in a 2016 GMC Sierra?

- Common symptoms include loss of communication with the remote heater and air conditioning control module, resulting in issues with controlling the vehicle's heating and air conditioning system.

2. What can cause the OBDII code U184B to appear in a 2016 GMC Sierra?

- The code U184B typically indicates a communication problem on the low-speed Controller Area Network (CAN) bus between the vehicle's onboard computer and the remote heater and air conditioning control module.

3. How can I diagnose the root cause of the U184B code in my 2016 GMC Sierra?

- Diagnosing the U184B code may require checking the wiring connections, inspecting for damaged wires or connectors, and verifying the proper functioning of the remote heater and air conditioning control module.

4. Is it safe to continue driving my 2016 GMC Sierra with the U184B code present?

- It is not recommended to continue driving the vehicle with the U184B code active, as it may lead to further issues with the heating and air conditioning system and potentially affect overall vehicle performance.

5. What are some repair tips for fixing the U184B code in a 2016 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, resetting the code with a diagnostic tool, and testing the heating and air conditioning system for functionality.

6. Can the U184B code be cleared/reset without fixing the underlying issue in a 2016 GMC Sierra?

- While the code can be cleared temporarily using a diagnostic tool, it is essential to address the root cause of the communication problem to prevent the code from reoccurring.

7. How much does it typically cost to repair the U184B code in a 2016 GMC Sierra?

- Repair costs for the U184B code can vary depending on the extent of the issue, but they may involve labor costs for diagnosis and repair, as well as potential expenses for replacement parts or components.

8. Will resetting the vehicle's battery clear the U184B code in a 2016 GMC Sierra?

- Resetting the vehicle's battery may temporarily clear the code, but if the underlying communication issue persists, the code is likely to reappear once the system detects the problem again.

9. Can a DIY enthusiast fix the U184B code issue in a 2016 GMC Sierra?

- Depending on the individual's skill level and access to tools and resources, some DIY enthusiasts may be able to diagnose and repair the U184B code, but it is recommended to seek professional help for more complex issues.

10. How can I prevent the U184B code from reoccurring in my 2016 GMC Sierra?

- To prevent the U184B code from reoccurring, it is essential to address any underlying communication issues promptly, perform regular maintenance checks on the vehicle's systems, and follow proper diagnostic procedures when dealing with related problems.

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