AutoCodes – Generic – U184D

U184D 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 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 992

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

What does this mean?

What are the Possible Causes of the DTC U184D?

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

How to Fix the DTC U184D?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

U184D Buick — Lost Communication with Radio on Low Speed CAN Bus
U184D Cadillac — Lost Communication with Radio on Low Speed CAN Bus
U184D Chevrolet — Lost Communication with Radio on Low Speed CAN Bus
U184D GMC — 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 Code

What does the OBDII code U184D mean?

The U184D code indicates a loss of communication with the radio on the low-speed Controller Area Network (CAN) bus, which is responsible for communication between various electronic modules in the vehicle.

What are the common symptoms of the U184D code?

Common symptoms include issues with the radio functionality, such as the radio not turning on, intermittent sound, or display issues. You may also experience problems with other audio or infotainment features.

What could cause the U184D code to appear?

Causes can include a faulty radio, damaged wiring or connectors, issues with the low-speed CAN bus, or problems with the vehicle's body control module that affects communication.

How can I diagnose the U184D code?

To diagnose the U184D code, start by checking for any other related trouble codes, inspect wiring and connectors for damage, and ensure that the radio and other modules are functioning properly.

What are some repair tips for the U184D code?

Repair tips include checking and repairing any damaged wiring, ensuring connectors are secure, resetting the radio, and if necessary, replacing the radio or the body control module.

Can the U184D code affect my vehicle's performance?

While the U184D code primarily affects the radio and infotainment system, it can also lead to issues with other modules that rely on the low-speed CAN bus, potentially affecting overall vehicle functionality.

Is it safe to drive with the U184D code?

Yes, it is generally safe to drive with the U184D code, as it primarily affects the radio and associated systems. However, it is advisable to address the issue to restore full functionality of the vehicle's electronic features.

How can I clear the U184D code after repairs?

You can clear the U184D code using an OBDII scanner that has the capability to erase trouble codes. After repairs, ensure that the vehicle is properly tested to confirm the issue is resolved before clearing the code.

Should I consult a professional mechanic for the U184D code?

If you are unable to diagnose or repair the issue on your own, or if the problem persists after your attempts, it is a good idea to consult a professional mechanic who can perform a thorough diagnostic.