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Engine-Codes – GMC – U184D 2016 GMC Sierra

U184D 2016 GMC Sierra Code - Lost Communication with Radio on Low Speed CAN Bus

Quick Answer

The diagnostic trouble code U184D for a 2016 GMC Sierra indicates that there has been a loss of communication with the radio on the Low Speed Controller Area Network (CAN) bus. Common causes include Loose or corroded wiring connections in the Low Speed CAN bus network, Damaged wiring harness affecting communication with the radio, Faulty radio unit or internal components. 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
U184D 2016 GMC Sierra indicates Lost Communication with Radio on Low Speed CAN Bus.
Common causes
Common causes include Loose or corroded wiring connections in the Low Speed CAN bus network, Damaged wiring harness affecting communication with the radio, Faulty radio unit or internal components.
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 14, 2024
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Code U184D 2016 GMC Sierra Description

The diagnostic trouble code U184D for a 2016 GMC Sierra indicates that there has been a loss of communication with the radio on the Low Speed Controller Area Network (CAN) bus. The CAN bus is a system used in modern vehicles to allow different electronic control units (ECUs) to communicate with each other. In this case, the communication between the radio and other modules on the Low Speed CAN bus has been disrupted or lost.

OBDII Code U184D 2016 GMC Sierra - Lost Communication with Radio on Low Speed CAN Bus
U184D 2016 GMC Sierra Code - Lost Communication with Radio on Low Speed CAN Bus

Common Causes of U184D 2016 GMC Sierra

  1. Loose or corroded wiring connections in the Low Speed CAN bus network
  2. Damaged wiring harness affecting communication with the radio
  3. Faulty radio unit or internal components
  4. Software issues causing communication disruptions
  5. Interference from aftermarket electronic accessories affecting the CAN bus communication

Symptoms of U184D 2016 GMC Sierra

  1. Radio not functioning properly (no sound, display issues, controls not responsive)
  2. Loss of steering wheel controls for audio system
  3. Vehicle information display showing error messages related to communication
  4. Inability to adjust certain vehicle settings through the radio interface

How to Fix U184D 2016 GMC Sierra

  1. Perform a thorough inspection of the wiring connections in the Low Speed CAN bus network and repair any loose or corroded connections.
  2. Check the wiring harness for any damage or wear and replace as needed.
  3. Test the radio unit for proper functionality and replace if found to be faulty.
  4. Update or reprogram the software in the affected modules to address communication issues.
  5. Remove any aftermarket electronic accessories that may be causing interference with the CAN bus communication.

Cost to Fix U184D 2016 GMC Sierra

The typical repair costs for addressing the U184D code on a 2016 GMC Sierra can vary depending on the specific cause of the communication loss. In general, the cost of parts such as wiring harnesses or a replacement radio unit can range from $200 to $500 or more. Labor costs for diagnosis and repair can add an additional $200 to $500, depending on the shop's hourly rates and the complexity of the repair process.

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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 U184D 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code U184D on a 2016 GMC Sierra?

- Common symptoms include loss of communication with the radio, malfunctioning infotainment system, and possible issues with other low-speed CAN bus modules.

2. What could cause the U184D code in a 2016 GMC Sierra?

- The U184D code is typically triggered by a communication error between the radio module and the low-speed CAN bus network, which can be caused by wiring issues, a faulty radio module, or a problem with the CAN bus network itself.

3. How can I diagnose the U184D code on my 2016 GMC Sierra?

- Diagnosis involves checking the wiring connections between the radio module and the CAN bus network, testing the radio module for functionality, and using a diagnostic scanner to communicate with the affected modules on the CAN bus network.

4. What are some repair tips for fixing the U184D code on a 2016 GMC Sierra?

- Repair tips include inspecting and repairing any damaged wiring, replacing the faulty radio module if necessary, ensuring proper connections, and resetting the fault codes after repairs are completed.

5. Can the U184D code on a 2016 GMC Sierra cause any other issues with the vehicle?

- While the U184D code itself may not directly affect the vehicle's drivability, it can result in the loss of certain features like the radio and infotainment system. It is important to address the code to prevent any potential issues with other CAN bus modules.

6. Is it safe to continue driving my 2016 GMC Sierra with the U184D code present?

- It is generally safe to drive the vehicle with the U184D code, but it is recommended to address the issue promptly to avoid any inconvenience caused by the malfunctioning radio or potential communication problems with other modules on the CAN bus network.

7. Can I clear the U184D code on my 2016 GMC Sierra without fixing the underlying issue?

- While you can clear the fault code temporarily, it is not recommended as the issue will likely resurface until the root cause is addressed. Clearing the code without proper repair may lead to ongoing communication problems with the radio module.

8. Do I need specialized tools to repair the U184D code on my 2016 GMC Sierra?

- A diagnostic scanner capable of communicating with the vehicle's modules on the CAN bus network is essential for diagnosing and repairing the U184D code. Basic tools like a multimeter may also be useful for checking wiring continuity.

9. How long does it take to repair the U184D code on a 2016 GMC Sierra?

- The repair time for the U184D code can vary depending on the underlying cause. Simple fixes like reseating connectors may take a short time, while replacing a faulty radio module or repairing wiring issues could require more extensive work.

10. Can I fix the U184D code on my 2016 GMC Sierra myself, or should I seek professional help?

- If you have experience with automotive electrical systems and access to the necessary tools, you may be able to diagnose and repair the U184D code yourself. However, if you are unsure or uncomfortable working on these systems, it is advisable to seek help from a professional mechanic or technician.

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