AutoCodes – Generic – U0184

U0184 Code - Lost Communication With Radio Unit

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. 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 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 27,017

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 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Radio Unit has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0184?

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

How to Fix the DTC U0184?

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 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 code?

Need more information on how to fix the U0184 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0184 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0184 Buick — Lost Communication With Radio Unit
U0184 Cadillac — Lost Communication With Radio Unit
U0184 Chevrolet — Lost Communication With Radio Unit
U0184 Chrysler — Lost Communication With Radio Unit
U0184 Dodge — Lost Communication With Radio Unit
U0184 Ford — Lost Communication With Radio
U0184 GMC — Lost Communication With Radio Unit
U0184 Jeep — Lost Communication With Radio Unit
U0184 Lincoln — Lost Communication With Radio
U0184 Mercury — Lost Communication With Radio
U0184 RAM — Lost Communication With Radio Unit

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 Code

1. What are common symptoms of OBDII code U0184, Lost Communication With Radio Unit?

The common symptoms include loss of radio function, issues with Bluetooth connectivity, and potential display screen malfunctions.

2. What are possible causes of OBDII code U0184?

Potential causes include a faulty radio unit, damaged wiring or connectors, a software glitch, or a problem with the vehicle's communication network.

3. How can I diagnose the cause of OBDII code U0184?

To diagnose the issue, you can start by checking the wiring and connectors related to the radio unit, performing a software update, and using a diagnostic scanner to pinpoint the exact communication fault.

4. Can I still drive my vehicle with OBDII code U0184 present?

In most cases, it is safe to drive the vehicle with this code as it primarily affects non-essential functions like the radio. However, it's recommended to address the issue promptly to avoid any potential communication network problems.

5. How can I repair OBDII code U0184, Lost Communication With Radio Unit?

The repair process involves fixing any damaged wiring or connectors, replacing the faulty radio unit if necessary, ensuring software updates are current, and resetting the diagnostic trouble codes.

6. Is it possible to reset OBDII code U0184 without fixing the underlying issue?

While you can clear the code temporarily, it will likely reappear until you address the communication problem between the vehicle and the radio unit.

7. Could a dead battery cause OBDII code U0184 to appear?

Yes, a dead or disconnected battery can sometimes trigger this code as it disrupts the communication network within the vehicle.

8. Are there any common issues with specific vehicle makes or models related to code U0184?

Certain vehicle makes or models known for electrical issues may be more prone to experiencing code U0184, but it can occur across various vehicles with sophisticated communication systems.

9. Can a DIY enthusiast fix OBDII code U0184, or is it better left to professionals?

Depending on your skill level and access to tools, you may be able to diagnose and repair this code yourself by following troubleshooting steps. However, if you're unsure, it's best to consult a professional technician.

10. How long does it typically take to repair OBDII code U0184?

The repair time can vary depending on the exact cause of the communication issue. Simple fixes like reconnecting loose wiring may take just a few minutes, while more complex problems could require several hours of diagnosis and repair.