AutoCodes – GMC – U184C 2018 GMC Sierra

U184C 2018 GMC Sierra 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 2018 GMC Sierra 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 215

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 Jul 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U184C 2018 GMC Sierra 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 2018 GMC Sierra - Lost Communication with Instrument Cluster on Low Speed CAN Bus - AutoCodes.com — U184C 2018 GMC Sierra Code - Lost Communication with Instrument Cluster on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U184C 2018 GMC Sierra?

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

How to Fix the DTC U184C 2018 GMC Sierra?

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 2018 GMC Sierra 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 2018 GMC Sierra code?

Need more information on how to fix the U184C 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 U184C 2018 GMC Sierra Code

1. What are common symptoms of OBDII code U184C in a 2018 GMC Sierra related to lost communication with the instrument cluster on the low-speed CAN bus?

- The common symptoms include the instrument cluster not functioning properly, warning lights illuminating unexpectedly, and loss of communication with the vehicle's diagnostic system.

2. What are possible causes of OBDII code U184C in a 2018 GMC Sierra indicating lost communication with the instrument cluster on the low-speed CAN bus?

- Possible causes may include a faulty instrument cluster, damaged wiring or connectors in the CAN bus system, a defective control module, or software glitches.

3. How can I diagnose the issue related to OBDII code U184C in a 2018 GMC Sierra myself?

- You can start by checking the wiring and connectors for any visible damage or corrosion, ensuring they are securely connected. You may also try resetting the vehicle's computer system by disconnecting the battery for a few minutes.

4. Is it safe to continue driving a 2018 GMC Sierra with OBDII code U184C indicating lost communication with the instrument cluster on the low-speed CAN bus?

- It is not recommended to drive the vehicle with this issue as it can affect crucial functions like displaying important information and warning signals. It is best to address the problem promptly.

5. Can I reset OBDII code U184C in a 2018 GMC Sierra myself, and will it solve the issue of lost communication with the instrument cluster?

- While you can clear the code using an OBDII scanner, it is essential to investigate and address the root cause of the problem to prevent the code from reoccurring. Simply clearing the code may not fix the underlying issue.

6. How much does it typically cost to repair OBDII code U184C in a 2018 GMC Sierra caused by lost communication with the instrument cluster on the low-speed CAN bus?

- The cost of repair can vary depending on the specific cause of the issue. It is advisable to consult a professional mechanic for a proper diagnosis and cost estimation.

7. Are there any common DIY repair tips for addressing OBDII code U184C in a 2018 GMC Sierra related to lost communication with the instrument cluster?

- DIY repair tips may include checking and cleaning the connectors in the CAN bus system, inspecting for any visible wiring damage, and ensuring all connections are secure. However, more complex issues may require professional assistance.

8. How long does it typically take to repair OBDII code U184C in a 2018 GMC Sierra involving lost communication with the instrument cluster on the low-speed CAN bus?

- The repair time can vary based on the specific cause of the problem. Simple fixes like checking connections may take a short time, while more complex issues could require more extensive diagnostics and repairs, possibly extending the repair duration.

9. Can extreme weather conditions or environmental factors contribute to OBDII code U184C in a 2018 GMC Sierra related to lost communication with the instrument cluster on the low-speed CAN bus?

- Yes, extreme temperatures or moisture can potentially damage wiring or connectors, leading to communication issues within the CAN bus system. It is important to keep the vehicle protected from such conditions.

10. Is it possible for OBDII code U184C in a 2018 GMC Sierra to reoccur after being repaired for lost communication with the instrument cluster on the low-speed CAN bus?

- If the root cause of the issue is not properly addressed during the repair, there is a possibility for the code to reoccur. It is vital to ensure a thorough diagnosis and repair to prevent future occurrences of the problem.