AutoCodes – GMC – U184D GMC

U184D GMC 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 GMC 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 628

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 Aug 09, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U184D GMC 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 GMC - Lost Communication with Radio on Low Speed CAN Bus - AutoCodes.com — U184D GMC Code - Lost Communication with Radio on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U184D GMC?

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

How to Fix the DTC U184D GMC?

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 GMC 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 GMC code?

Need more information on how to fix the U184D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U184D GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

U184D 2014 GMC Sierra — Lost Communication with Radio on Low Speed CAN Bus
U184D 2015 GMC Sierra — Lost Communication with Radio on Low Speed CAN Bus
U184D 2016 GMC Sierra — Lost Communication with Radio on Low Speed CAN Bus
U184D 2017 GMC Sierra — Lost Communication with Radio on Low Speed CAN Bus
U184D 2018 GMC Sierra — Lost Communication with Radio on Low Speed CAN Bus

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 GMC Code

1. What are the common symptoms of OBDII code U184D GMC (Lost Communication with Radio on Low Speed CAN Bus)?

- Common symptoms include a malfunctioning radio display, loss of sound from the radio, and issues with steering wheel controls.

2. What are the possible causes of OBDII code U184D GMC?

- Possible causes include a faulty radio unit, damaged wiring or connectors in the low-speed CAN bus network, or a communication error within the vehicle's network.

3. How can I diagnose the source of the U184D GMC code?

- To diagnose the issue, you can use a diagnostic scan tool to check for additional trouble codes, inspect the wiring and connectors related to the radio and CAN bus, and perform communication tests within the vehicle's network.

4. Can a DIY enthusiast repair the U184D GMC code at home?

- Repairing the U184D code may require specialized knowledge and tools, so it is recommended to seek assistance from a professional mechanic or dealership to properly diagnose and fix the issue.

5. Is it safe to continue driving with the U184D GMC code present?

- While the vehicle may still be drivable with the U184D code, it is recommended to address the issue promptly to prevent any further damage or potential safety hazards.

6. How much does it typically cost to repair the U184D GMC code?

- The cost of repairing the U184D code can vary depending on the underlying cause and the labor rates of the repair facility. It is advisable to obtain quotes from multiple sources before proceeding with the repair.

7. Can resetting the OBDII code U184D GMC resolve the issue temporarily?

- Resetting the code may temporarily clear the error message, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. Are there any preventive maintenance tips to avoid encountering the U184D GMC code in the future?

- Regularly inspecting the wiring and connectors related to the radio and CAN bus system, as well as keeping the vehicle's software up to date, can help prevent issues leading to the U184D code.

9. Will disconnecting the radio unit resolve the U184D GMC code?

- Disconnecting the radio unit may temporarily stop the communication error but it is not a recommended solution. It is best to diagnose and repair the root cause of the U184D code for a lasting fix.

10. Can extreme weather conditions contribute to triggering the U184D GMC code?

- Extreme weather conditions, such as temperature fluctuations or moisture exposure, can potentially affect the electrical connections and components in the vehicle, leading to communication errors like the U184D code.