AutoCodes – GMC – U184C GMC

U184C GMC Code - Lost Communication with Instrument Cluster 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 Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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: U184C GMC indicates Lost Communication with Instrument Cluster on Low Speed CAN Bus.
Common causes: Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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 570

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 U184C 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 U184C GMC - Lost Communication with Instrument Cluster on Low Speed CAN Bus - AutoCodes.com — U184C GMC Code - Lost Communication with Instrument Cluster on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U184C GMC?

Faulty Instrument Cluster
Instrument Cluster harness is open or shorted
Instrument Cluster circuit poor electrical connection

How to Fix the DTC U184C 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 U184C 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 U184C GMC code?

Need more information on how to fix the U184C GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

U184C 2014 GMC Sierra — Lost Communication with Instrument Cluster on Low Speed CAN Bus
U184C 2015 GMC Sierra — Lost Communication with Instrument Cluster on Low Speed CAN Bus
U184C 2016 GMC Sierra — Lost Communication with Instrument Cluster on Low Speed CAN Bus
U184C 2017 GMC Sierra — Lost Communication with Instrument Cluster on Low Speed CAN Bus
U184C 2018 GMC Sierra — Lost Communication with Instrument Cluster 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 U184C GMC Code

1. What are the common symptoms of OBDII code U184C GMC?

When this code is present, you may experience issues such as the instrument cluster failing to display information, warning lights coming on, and gauges not working properly.

2. What can cause the OBDII code U184C GMC to occur?

This code typically indicates a communication problem between the vehicle's main computer and the instrument cluster on the Low Speed CAN Bus. Possible causes include wiring issues, a faulty instrument cluster, or a problem with the CAN bus network.

3. How can I diagnose the source of the U184C GMC code?

To diagnose this code, it's recommended to perform a thorough inspection of the wiring harness connected to the instrument cluster, check for any loose connections, and use a diagnostic scanner to monitor the communication between modules on the Low Speed CAN Bus.

4. What are some repair tips for addressing the U184C GMC trouble code?

Start by checking and repairing any damaged wiring or loose connections in the instrument cluster circuit. If the issue persists, consider testing the instrument cluster itself for faults and ensuring proper communication on the Low Speed CAN Bus network.

5. Can driving with the U184C GMC code present cause any further damage to the vehicle?

Continuing to drive with this code may result in inaccurate readings from the instrument cluster, potentially affecting your ability to monitor vehicle functions accurately. It's best to address the underlying issue promptly to prevent any further complications.

6. Is it possible to reset the U184C GMC code without fixing the underlying problem?

While clearing the trouble code may temporarily remove the warning lights, the underlying issue causing the code will persist. It's essential to diagnose and repair the root cause to prevent the code from reoccurring.

7. How much does it typically cost to repair the U184C GMC code?

The cost of repairing this code can vary depending on the specific cause of the communication issue. Simple fixes like repairing wiring may be relatively inexpensive, while replacing the instrument cluster or addressing complex CAN bus network problems could be more costly.

8. Can I repair the U184C GMC code myself, or should I seek professional help?

If you have experience with automotive electrical systems and diagnostic tools, you may attempt to diagnose and repair this code yourself. However, for more complex issues or if you're unsure about the repair process, it's recommended to consult a professional mechanic.

9. Are there any recalls or technical service bulletins related to the U184C GMC code?

It's advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to the U184C GMC code. They may have specific repair procedures or solutions for addressing this issue.

10. How can I prevent the U184C GMC code from occurring in the future?

Regularly inspecting and maintaining the vehicle's wiring harnesses, connectors, and modules can help prevent communication issues like the U184C code. Ensuring proper installation of aftermarket accessories and avoiding water damage to electrical components can also reduce the risk of this code occurring.