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U184A 2014 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Quick Answer

The U184A diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) bus. Common causes include Faulty Body Control Module (BCM), Wiring or connection issues in the Low Speed CAN bus circuit, ECM software or hardware problems. 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 2014 GMC Sierra indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
Common causes
Common causes include Faulty Body Control Module (BCM), Wiring or connection issues in the Low Speed CAN bus circuit, ECM software or hardware problems.
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 16, 2024
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Code U184A 2014 GMC Sierra Description

The U184A diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) bus. The CAN bus is a network that allows different modules in the vehicle to communicate with each other. When the ECM cannot establish communication with the BCM on the Low Speed CAN bus, it can lead to various issues affecting the vehicle's performance.

OBDII Code U184A 2014 GMC Sierra - Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2014 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Common Causes of U184A 2014 GMC Sierra

  1. Faulty Body Control Module (BCM)
  2. Wiring or connection issues in the Low Speed CAN bus circuit
  3. ECM software or hardware problems
  4. Electrical interference or shorts in the communication network
  5. Water damage or corrosion in the BCM or ECM connectors

Symptoms of U184A 2014 GMC Sierra

  1. Inoperative power windows or door locks
  2. Malfunctioning interior or exterior lighting
  3. Climate control system not working properly
  4. Warning lights illuminated on the dashboard
  5. Loss of communication with other modules in the vehicle

How to Fix U184A 2014 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connectors in the Low Speed CAN bus circuit to check for any damage, corrosion, or loose connections.
  2. Test the Body Control Module (BCM) and Engine Control Module (ECM) for proper functionality using a diagnostic scan tool to identify any faults or errors.
  3. If necessary, replace the faulty BCM or ECM with a new unit and reprogram it to ensure compatibility with the vehicle.
  4. Clear the DTC from the vehicle's memory using the diagnostic tool and perform a test drive to verify that the issue has been resolved.
  5. Conduct a final scan to confirm that the communication between the ECM and BCM on the Low Speed CAN bus is restored and that all systems are functioning correctly.

Cost to Fix U184A 2014 GMC Sierra

The typical repair costs for addressing a U184A code on a 2014 GMC Sierra can vary depending on the specific cause of the issue and the parts or components that need to be replaced. In general, the cost of replacing a faulty Body Control Module (BCM) or Engine Control Module (ECM) can range from $300 to $800, including parts and labor. However, additional diagnostic fees and programming costs may apply, so the total repair bill could be higher.

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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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code U184A in a 2014 GMC Sierra?

- Common symptoms include non-functioning power windows, door locks, interior lights, and other body control module-related features.

2. What can cause the OBDII code U184A to trigger in a 2014 GMC Sierra?

- The code U184A is usually triggered when there is a communication loss between the body control module and the low-speed CAN bus network.

3. How can I diagnose the issue causing the U184A code in my 2014 GMC Sierra?

- Diagnosis typically involves checking the wiring connections, inspecting for damaged wires or connectors, and using a scan tool to monitor communication on the CAN bus network.

4. Is it safe to drive my 2014 GMC Sierra with the U184A code present?

- It is not recommended to drive the vehicle with the U184A code active, as it can lead to potential safety issues due to non-functioning body control module features.

5. Can a DIY enthusiast repair the U184A code issue in a 2014 GMC Sierra?

- While some basic troubleshooting like checking connections can be done, diagnosing and repairing the root cause of the U184A code often requires professional diagnostic tools and expertise.

6. How much does it typically cost to repair the U184A code in a 2014 GMC Sierra?

- The cost of repair can vary depending on the specific cause of the communication loss, but it can range from a few hundred to over a thousand dollars at a dealership or repair shop.

7. Are there any preventive measures to avoid the U184A code issue in a 2014 GMC Sierra?

- Regularly checking the electrical connections, avoiding water damage, and addressing any electrical issues promptly can help prevent the U184A code from occurring.

8. Can a weak battery or alternator cause the U184A code in a 2014 GMC Sierra?

- Yes, a weak battery or alternator can potentially cause communication issues between the body control module and the low-speed CAN bus, leading to the U184A code.

9. Will resetting the OBDII code U184A in a 2014 GMC Sierra make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the U184A code is not addressed, it is likely to reappear.

10. How long does it take to repair the U184A code issue in a 2014 GMC Sierra?

- The repair time can vary depending on the exact cause of the problem, but it typically takes a few hours to a full day for a professional technician to diagnose and fix the issue.

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