AutoCodes – GMC – U0184 GMC

U0184 GMC Code - Lost Communication With Radio Unit

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Radio Unit, Radio Unit harness is open or shorted, Radio Unit 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: U0184 GMC indicates Lost Communication With Radio Unit.
Common causes: Common causes include Faulty Radio Unit, Radio Unit harness is open or shorted, Radio Unit 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 4,368

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 Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0184 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Radio Unit has not been received.

OBDII Code U0184 GMC - Lost Communication With Radio Unit - AutoCodes.com — U0184 GMC Code - Lost Communication With Radio Unit

What does this mean?

What are the Possible Causes of the DTC U0184 GMC?

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

How to Fix the DTC U0184 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 U0184 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 U0184 GMC 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 U0184 GMC Code

1. What are the common symptoms of OBDII code U0184 GMC (Lost Communication With Radio Unit)?

- Common symptoms include the radio not working, loss of communication with the radio unit, and potential issues with other electronic components in the vehicle.

2. What are the possible causes of OBDII code U0184 GMC?

- Possible causes include a faulty radio unit, wiring or connection issues, a blown fuse, software malfunctions, or a problem with the vehicle's communication network.

3. How can I diagnose OBDII code U0184 GMC?

- Diagnosis typically involves checking the radio unit for power and ground, inspecting the wiring and connections, scanning the vehicle's network for communication errors, and using a diagnostic scanner to retrieve trouble codes.

4. Can a DIY enthusiast repair OBDII code U0184 GMC?

- Depending on the cause, some DIY repairs may include checking and repairing wiring connections, resetting the radio unit, or replacing a blown fuse. However, more complex issues may require professional diagnosis and repair.

5. Are there any specific repair tips for resolving OBDII code U0184 GMC?

- Ensure all wiring connections to the radio unit are secure and free of corrosion, check for any blown fuses related to the radio system, and consider resetting the radio unit by disconnecting the battery for a few minutes.

6. Is it safe to continue driving with OBDII code U0184 GMC present?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential problems with other electronic systems and to ensure the radio unit functions properly.

7. Can a malfunctioning radio unit cause OBDII code U0184 GMC?

- Yes, a malfunctioning radio unit can disrupt communication on the vehicle's network, triggering the U0184 trouble code. It is essential to address any issues with the radio unit to resolve this code.

8. What should I do if resetting the radio unit does not clear OBDII code U0184 GMC?

- If resetting the radio unit does not resolve the issue, consider checking the wiring harness for damage, inspecting other components on the vehicle's network, or seeking assistance from a professional technician.

9. Is OBDII code U0184 GMC a common issue in GMC vehicles?

- While not extremely common, U0184 (Lost Communication With Radio Unit) can occur in GMC vehicles, especially in models with advanced infotainment systems that rely heavily on communication networks.

10. How can a professional technician further diagnose OBDII code U0184 GMC?

- A professional technician can perform advanced diagnostic tests using specialized equipment to pinpoint the exact cause of the communication loss with the radio unit, such as checking network communication signals and conducting in-depth component testing.