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Engine-Codes – GMC – U184B GMC

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

Quick Answer

The U184B GMC code indicates that there is a communication problem between the vehicle's main computer and the Remote Heater and Air Conditioning Control Module on the Low Speed CAN Bus. Common causes include Faulty wiring connections, Defective Remote Heater and Air Conditioning Control Module, Software glitches in the vehicle's computer system. 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 GMC indicates Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus.
Common causes
Common causes include Faulty wiring connections, Defective Remote Heater and Air Conditioning Control Module, Software glitches in the vehicle's computer system.
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 17, 2024
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Code U184B GMC Description

The U184B GMC code indicates that there is a communication problem between the vehicle's main computer and the Remote Heater and Air Conditioning Control Module on the Low Speed CAN Bus. The Low Speed CAN Bus is a communication network that allows various modules in the vehicle to exchange information. When communication is lost with the Remote Heater and Air Conditioning Control Module, it can lead to issues with controlling the heating and air conditioning systems in the vehicle.

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

Common Causes of U184B GMC

  1. Faulty wiring connections
  2. Defective Remote Heater and Air Conditioning Control Module
  3. Software glitches in the vehicle's computer system
  4. Corrosion or damage to the CAN Bus network
  5. Electrical interference from aftermarket accessories

Symptoms of U184B GMC

  1. Inability to adjust temperature settings
  2. Erratic fan speed control
  3. Air conditioning not cooling properly
  4. Heating system not functioning correctly
  5. Dashboard warning light related to HVAC system

How to Fix U184B GMC

  1. Begin by conducting a visual inspection of the wiring connections related to the Remote Heater and Air Conditioning Control Module.
  2. Use a diagnostic tool to scan for any stored trouble codes and attempt to communicate with the module.
  3. Test the module for proper functionality and replace if necessary.
  4. Check for any software updates for the vehicle's computer system that may address communication issues.
  5. Clear the trouble codes and perform a test drive to ensure the HVAC system is operating correctly.

Cost to Fix U184B GMC

The typical repair costs for addressing a U184B GMC code can vary depending on the specific cause of the communication issue. In general, the cost of parts such as a new Remote Heater and Air Conditioning Control Module and labor for diagnosis and repair can range from $200 to $600. It's important to note that actual costs may differ based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to obtain quotes from local shops for a more accurate cost estimate.

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Information for Specific GMC Models

  • U184B 2014 GMC Sierra — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
  • U184B 2015 GMC Sierra — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
  • U184B 2016 GMC Sierra — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
  • U184B 2017 GMC Sierra — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
  • U184B 2018 GMC Sierra — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
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 GMC Code

1. What are common symptoms of OBDII code U184B GMC?

- Common symptoms include loss of communication with the remote heater and air conditioning control module, inoperative heater or air conditioning system, and dashboard warning lights.

2. What can cause the OBDII code U184B GMC to appear?

- The code may appear due to issues such as damaged wiring, a faulty control module, poor electrical connections, or a malfunctioning CAN bus system.

3. How can I diagnose the cause of the U184B GMC code?

- Diagnose the code by checking the wiring and connections related to the remote heater and air conditioning control module, testing the module itself, and using a diagnostic scanner to assess the CAN bus communication.

4. What are some repair tips for resolving the U184B GMC trouble code?

- Repair tips include repairing or replacing damaged wiring, ensuring proper electrical connections, replacing the remote heater and air conditioning control module if needed, and addressing any underlying CAN bus issues.

5. Can the U184B GMC code be cleared/reset without fixing the underlying issue?

- While clearing the code may temporarily turn off the warning light, it is important to address the underlying issue causing the code to prevent further problems with the heater and air conditioning system.

6. Is it safe to continue driving with the U184B GMC trouble code present?

- It is not recommended to drive with the U184B code present, as it may indicate a potential issue with the heater and air conditioning system, which can affect comfort and safety while driving.

7. How much does it typically cost to repair the U184B GMC code?

- The cost of repairing the U184B code can vary depending on the specific issue, but it may involve expenses such as parts replacement, labor costs, and diagnostic fees.

8. Can I fix the U184B GMC code myself, or do I need a professional mechanic?

- Depending on your automotive repair skills and knowledge, you may be able to address the U184B code yourself by following repair guides and using diagnostic tools. However, complex issues may require the expertise of a professional mechanic.

9. Will the U184B GMC trouble code cause my vehicle to fail an emissions test?

- The U184B code itself may not directly cause the vehicle to fail an emissions test, but unresolved issues related to the heater and air conditioning system can impact overall vehicle performance and emissions.

10. How can I prevent the U184B GMC code from reoccurring in the future?

- To prevent the U184B code from reoccurring, regularly inspect and maintain the electrical system, ensure proper connections, address any warning lights promptly, and follow recommended maintenance schedules for your vehicle.

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