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Engine-Codes – GMC – U184A 2018 GMC Sierra

U184A 2018 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Quick Answer

The U184A diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) bus. Common causes include Loose or corroded wiring/connectors in the CAN bus network, Faulty Body Control Module, ECM software or hardware issues. 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
U184A 2018 GMC Sierra indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
Common causes
Common causes include Loose or corroded wiring/connectors in the CAN bus network, Faulty Body Control Module, ECM software or hardware issues.
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 11, 2024
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Code U184A 2018 GMC Sierra Description

The U184A diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) bus. The CAN bus is a communication network that allows various control modules within the vehicle to exchange information and commands.

OBDII Code U184A 2018 GMC Sierra - Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2018 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Common Causes of U184A 2018 GMC Sierra

  1. Loose or corroded wiring/connectors in the CAN bus network
  2. Faulty Body Control Module
  3. ECM software or hardware issues
  4. Electrical interference
  5. Water damage or exposure to moisture

Symptoms of U184A 2018 GMC Sierra

  1. Interior lights not working properly
  2. Power windows and door locks malfunctioning
  3. Keyless entry system not functioning
  4. Security system issues
  5. Loss of communication with other control modules

How to Fix U184A 2018 GMC Sierra

  1. Perform a visual inspection of the wiring/connectors in the CAN bus network and repair any damaged or corroded components.
  2. Check for any ECM software updates and apply if necessary.
  3. Test the Body Control Module for faults and replace if required.
  4. Perform a diagnostic scan tool test to ensure proper communication between the BCM and ECM.
  5. Clear the DTC and perform a road test to verify that the issue has been resolved.

Cost to Fix U184A 2018 GMC Sierra

The cost of repairing a U184A code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the cost of parts for a BCM replacement can range from $300 to $600, while the labor costs can range from $100 to $200. Overall, the total repair cost for this issue could be between $400 and $800. It's important to note that prices may vary based on location, vehicle make and model, and the specific repair shop. It's recommended to consult with a professional technician for an accurate cost estimate.

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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 U184A 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code U184A in a 2018 GMC Sierra?

The common symptoms of OBDII code U184A "Lost Communication with Body Control Module on Low Speed CAN Bus" in a 2018 GMC Sierra may include issues with power window operation, interior lighting problems, door lock malfunctions, and unresponsive climate control.

2. What are the possible causes of OBDII code U184A in a 2018 GMC Sierra?

Possible causes of OBDII code U184A in a 2018 GMC Sierra include a faulty Body Control Module (BCM), damaged wiring or connectors in the CAN bus network, corrosion in electrical connections, or a software glitch in the vehicle's system.

3. How can I diagnose OBDII code U184A in my 2018 GMC Sierra?

To diagnose OBDII code U184A in a 2018 GMC Sierra, you can use an OBDII scanner to retrieve the specific fault code, check the wiring and connectors for any visible damage, test the BCM for functionality, and perform a thorough inspection of the CAN bus network.

4. Can I drive my 2018 GMC Sierra with OBDII code U184A present?

It is not recommended to drive your 2018 GMC Sierra with OBDII code U184A present, as the communication loss with the Body Control Module can affect critical vehicle functions related to safety and performance.

5. How can I repair OBDII code U184A in my 2018 GMC Sierra?

To repair OBDII code U184A in a 2018 GMC Sierra, you may need to replace the Body Control Module if it is faulty, repair any damaged wiring or connectors in the CAN bus network, clear the fault code with an OBDII scanner, and perform a thorough system reset.

6. Are there any DIY tips for fixing OBDII code U184A in a 2018 GMC Sierra?

While diagnosing and repairing OBDII code U184A may require advanced automotive knowledge and tools, you can start by checking the fuses related to the Body Control Module, inspecting the wiring harness for visible damage, and ensuring all electrical connections are secure.

7. How much does it typically cost to repair OBDII code U184A in a 2018 GMC Sierra?

The cost of repairing OBDII code U184A in a 2018 GMC Sierra can vary depending on the specific cause of the communication loss with the Body Control Module. Costs may include parts such as a new BCM, labor for diagnostics and repairs, and any additional components needed.

8. Will resetting the OBDII code U184A in my 2018 GMC Sierra make it go away permanently?

Resetting the OBDII code U184A in your 2018 GMC Sierra may temporarily clear the fault code, but if the underlying issue causing the communication loss with the Body Control Module is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

9. Can extreme weather conditions contribute to OBDII code U184A appearing in a 2018 GMC Sierra?

Extreme weather conditions such as excessive heat or cold can potentially affect the electrical components and connections in a 2018 GMC Sierra, leading to communication issues with the Body Control Module and triggering OBDII code U184A.

10. Is it necessary to visit a dealership for OBDII code U184A repairs on a 2018 GMC Sierra?

While visiting a dealership with specialized technicians and equipment can be beneficial for diagnosing and repairing OBDII code U184A in a 2018 GMC Sierra, independent automotive repair shops with experience in diagnosing electrical issues may also be able to effectively address the problem.

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