AutoCodes – GMC – U184D 2018 GMC Sierra

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

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Radio, Radio harness is open or shorted, Radio circuit poor electrical connection. 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 Faulty Radio, Radio harness is open or shorted, Radio circuit poor electrical connection.
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.

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Code Popularity 354

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U184D 2018 GMC Sierra Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Codes (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of health message, detect its absence; those devices in turn set a DTC associated with the loss of state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC.

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

What does this mean?

What are the Possible Causes of the DTC U184D 2018 GMC Sierra?

Faulty Radio
Radio harness is open or shorted
Radio circuit poor electrical connection

How to Fix the DTC U184D 2018 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U184D 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U184D 2018 GMC Sierra code?

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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.