The U0184 Harley Code Gets Completely Explained

The U0184 Harley Code is a common issue that many Harley Davidson bike owners encounter. This code often appears when the bike’s Body Control Module (BCM) loses communication with the radio. While this code does not affect the bike’s functionality, it can be an annoyance for users, especially if they rely heavily on their radio during rides. Let’s delve deeper into what the U0184 Harley Code means, its possible causes, how to address it, and what the Harley Davidson community has to say. Ready? Let’s go.

What Does The U0184 Harley Code Mean?

The U0184 code signifies “Lost Communication with Radio.” This error occurs when the bike’s BCM, which is a part of the Control Area Network (CAN) bus system, cannot establish a connection with the radio. The CAN bus system is a complex communication network that allows different parts of the bike to communicate with each other. When the radio is not detected on this network, the U0184 code is triggered.

Here’s a break down of all of the codes (including this one) in one place:
– Unlock the Power of Harley Diagnostic Codes (PDF Included) (theseasonedwrench.com)

What Can Cause This Code?

Several issues can lead to the appearance of the U0184 code. These include:

An open circuit in the CAN bus (+ or -) to the radio
A short to power or ground in either CAN bus circuit

No power or ground to the radio module
In rare cases, a faulty control module can also trigger this error

How Do Aftermarket Mods Affect This?

Installing an aftermarket radio or head unit on a Harley Davidson can trigger the U0184 code due to compatibility issues with the motorcycle’s CAN Bus system.

Easy Solutions and Workarounds

BCM Reprogramming

If your Harley displays the U0184 code after a radio modification, reprogramming the BCM is a viable solution. This process requires specialized equipment and knowledge, so it’s best performed by a Harley Davidson dealer or a qualified technician.

Dummy Plug Installation

For motorcycles with aftermarket radios, installing a dummy plug into the original radio’s wiring harness can trick the BCM into believing the stock radio is still present, thus avoiding the U0184 code.

Aftermarket Installation Kits

Some aftermarket radios come with installation kits that include a “health signal” generator to communicate with the BCM, ensuring seamless integration and functionality.

Correct BCM Configuration

Ensure the BCM is correctly configured, especially after replacements or repairs. Incorrect configuration can lead to additional issues, such as improper functioning of the rear lights or other accessories.

Should You Be Concerned?

While the U0184 code does not directly affect the bike’s operation, it can be a cause for concern for those who frequently use their radio. When this code appears, the radio may fail to provide information, produce no sound, or even display a blank screen. In some cases, the radio might also fail to power up.

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What Does The Community Say?

The Harley Davidson community has shared various experiences and potential solutions for the U0184 code. Some users have reported successfully clearing the code by flashing the BCM. This process involves reprogramming the BCM to stop looking for the radio on the CAN bus system.

Others have suggested installing a “dummy” plug in the motorcycle side of the original radio’s wiring harness to resolve the issue. This plug, often referred to as a “Termination” or “Terminator”, simulates the presence of the radio on the CAN bus system.

A third option that some users have proposed involves reinstalling the original radio or an aftermarket radio that is compatible with the Harley CAN Bus system.

Community Example #1

Mike replaced the stock radio on his 2016 Road Glide with an aftermarket head unit and soon faced the U0184 code. Initially, he attempted to clear the code himself, but it persistently reappeared. After consulting with a Harley Davidson technician, Mike learned that the BCM was still attempting to communicate with the now-absent stock radio. The solution involved reprogramming the BCM to ignore the radio, effectively resolving the issue without affecting the functionality of the hand controls.

Community Example #2

Sarah’s 2014 CVO Road King displayed the U0184 code despite not having a radio. After multiple attempts to clear the code, a dealership diagnostic revealed a faulty BCM. Replacement of the BCM unit resolved the code, but not without a hiccup. The new BCM was initially misconfigured, leading to further issues with the rear lights. Proper reprogramming of the BCM, with attention to the specific wiring setup of Sarah’s bike, finally fixed the problem.

Are Any Repairs Necessary To Fix The Code?

In most cases, the U0184 code can be resolved without needing extensive repairs. The first step should always be to check for any other diagnostic fault codes. If additional codes related to bus communication or battery/ignition are present, they should be addressed first.

If the U0184 code persists after clearing other fault codes, it may be necessary to inspect the radio’s power and ground circuits, the CAN bus communication connections, and the radio’s wiring. These checks should be carried out using a digital volt-ohmmeter (DVOM) to ensure precise readings. If a fault is detected in any of these areas, it will need to be repaired.

How Can You Clear The Code?

The U0184 code can be cleared using a diagnostic scan tool. However, simply clearing the code may not necessarily resolve the underlying issue. If the code reappears, it indicates that the problem still exists and requires attention.

How Common Is Code U0184?

While the U0184 code is not the most common issue faced by Harley Davidson owners, it is not exactly rare either. It particularly affects models featuring an aftermarket head unit or those where the original radio has been removed or replaced.

The U0184 code is a nuisance that many Harley Davidson owners have had to deal with. While it does not impact the bike’s performance, it can affect the quality of your rides, especially if you enjoy listening to the radio while on the road. However, with the right knowledge and tools, you can diagnose and resolve this issue effectively.

Frequently Asked Questions

What does the U0184 code on a Harley indicate?

The U0184 code in a Harley-Davidson motorcycle generally signifies a communication problem with the radio. This code is triggered when the motorcycle’s main control unit (MCU) is unable to communicate with the radio, possibly due to wiring issues, a faulty radio unit, or problems with the motorcycle’s communication network.

What symptoms are associated with the U0184 code on a Harley?

When the U0184 code is present, the most noticeable symptom is typically the radio’s malfunction or complete non-functionality. The rider may also observe issues with other interconnected systems, and the check engine light might be activated due to the communication error.

Is it safe to ride a Harley with the U0184 code?

Riding a Harley with the U0184 code is generally safe as it primarily affects the radio system. However, it’s advisable to resolve any communication issues as they could indicate broader problems within the motorcycle’s electronic system.

How common are communication issues like the U0184 code in Harley motorcycles?

Communication issues such as those indicated by the U0184 code can occur, especially in newer models with advanced electronic systems. Regular maintenance and proper handling of the motorcycle’s electronics can help prevent such problems.