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U184D 2018 GMC Sierra Code - Lost Communication with Radio on Low Speed CAN Bus

Quick Answer

The diagnostic trouble code (DTC) U184D for a 2018 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, Faulty radio unit, Malfunctioning CAN bus 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
U184D 2018 GMC Sierra indicates Lost Communication with Radio on Low Speed CAN Bus.
Common causes
Common causes include Loose or corroded wiring connections, Faulty radio unit, Malfunctioning CAN bus 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 10, 2024
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Code U184D 2018 GMC Sierra Description

The diagnostic trouble code (DTC) U184D for a 2018 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 network in modern vehicles that allows various electronic control units (ECUs) to communicate with each other. In this case, the loss of communication with the radio can impact the vehicle's performance and functionality.

OBDII Code U184D 2018 GMC Sierra - Lost Communication with Radio on Low Speed CAN Bus
U184D 2018 GMC Sierra Code - Lost Communication with Radio on Low Speed CAN Bus

Common Causes of U184D 2018 GMC Sierra

  1. Loose or corroded wiring connections
  2. Faulty radio unit
  3. Malfunctioning CAN bus module
  4. Software glitches in the vehicle's computer system
  5. Water damage to the radio unit or wiring

Symptoms of U184D 2018 GMC Sierra

  1. Loss of radio display or functionality
  2. Inability to control radio settings from the steering wheel
  3. No sound output from the radio speakers
  4. Intermittent radio operation
  5. Illumination of the check engine light

How to Fix U184D 2018 GMC Sierra

  1. Inspect and clean wiring connections to ensure a secure connection.
  2. Test the radio unit for proper functionality or replace it if necessary.
  3. Check the CAN bus module for any faults and replace if needed.
  4. Update the vehicle's software to address any software glitches.
  5. Perform a comprehensive diagnostic scan to ensure that the communication error is resolved.

Cost to Fix U184D 2018 GMC Sierra

The cost estimate for repairing a lost communication with the radio on the Low Speed CAN bus can vary depending on the specific cause of the issue. On average, the repair costs for this type of problem could range from $200 to $500, including parts and labor. However, it's important to note that the actual repair costs may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic or auto repair shop for an accurate cost estimate tailored to your vehicle's situation. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates can vary significantly.

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code U184D in a 2018 GMC Sierra?

- Common symptoms include loss of communication with the radio, erratic radio behavior, and potential loss of other low-speed CAN bus functions.

2. What are the possible causes of the U184D code in a 2018 GMC Sierra?

- The code U184D typically indicates a communication issue between the radio and the low-speed CAN bus network. Possible causes include wiring issues, a faulty radio unit, or a problem with the CAN bus network itself.

3. How can I diagnose the U184D code in my 2018 GMC Sierra?

- Diagnosing the U184D code involves checking the wiring connections between the radio and the low-speed CAN bus network, testing the radio unit for functionality, and using a diagnostic tool to scan for communication errors.

4. Can the U184D code be fixed without professional help?

- While some simple wiring issues can be fixed by an experienced DIYer, diagnosing and repairing the U184D code often requires professional automotive diagnostic equipment and expertise.

5. What are some repair tips for resolving the U184D code in a 2018 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connection between the radio and the CAN bus network, and potentially replacing the radio unit if it is found to be faulty.

6. Is it safe to continue driving with the U184D code present in a 2018 GMC Sierra?

- It is generally not recommended to drive with the U184D code, as it may indicate a communication issue that could affect other systems on the low-speed CAN bus network. It is best to address the problem promptly.

7. How much does it typically cost to repair the U184D code in a 2018 GMC Sierra?

- The cost of repairing the U184D code can vary depending on the underlying cause. Costs may include labor for diagnosis and repair, replacement parts, and potential reprogramming of the radio unit.

8. Can resetting the OBDII system clear the U184D code in a 2018 GMC Sierra?

- Resetting the OBDII system may temporarily clear the code, but it is likely to return if the underlying issue causing the communication problem between the radio and the CAN bus network is not resolved.

9. Are there any recalls or technical service bulletins related to the U184D code in a 2018 GMC Sierra?

- It is advisable to check with a GMC dealership or online resources for any recalls or technical service bulletins related to the U184D code in the 2018 GMC Sierra, as manufacturers may release updates or remedies for known issues.

10. How can I prevent the U184D code from recurring in my 2018 GMC Sierra?

- Regularly inspecting and maintaining the wiring connections, keeping the radio unit in good condition, and addressing any communication issues promptly can help prevent the U184D code from recurring in the future.

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