AutoCodes – GMC – U184A 2018 GMC Sierra

U184A 2018 GMC Sierra Code - Lost Communication with Body Control Module 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 Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: U184A 2018 GMC Sierra indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 214

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U184A 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 U184A 2018 GMC Sierra - Lost Communication with Body Control Module on Low Speed CAN Bus - AutoCodes.com — U184A 2018 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U184A 2018 GMC Sierra?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection

How to Fix the DTC U184A 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 U184A 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 U184A 2018 GMC Sierra code?

Need more information on how to fix the U184A 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U184A 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 U184A 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code U184A in a 2018 GMC Sierra?

The common symptoms of OBDII code U184A "Lost Communication with Body Control Module on Low Speed CAN Bus" in a 2018 GMC Sierra may include issues with power window operation, interior lighting problems, door lock malfunctions, and unresponsive climate control.

2. What are the possible causes of OBDII code U184A in a 2018 GMC Sierra?

Possible causes of OBDII code U184A in a 2018 GMC Sierra include a faulty Body Control Module (BCM), damaged wiring or connectors in the CAN bus network, corrosion in electrical connections, or a software glitch in the vehicle's system.

3. How can I diagnose OBDII code U184A in my 2018 GMC Sierra?

To diagnose OBDII code U184A in a 2018 GMC Sierra, you can use an OBDII scanner to retrieve the specific fault code, check the wiring and connectors for any visible damage, test the BCM for functionality, and perform a thorough inspection of the CAN bus network.

4. Can I drive my 2018 GMC Sierra with OBDII code U184A present?

It is not recommended to drive your 2018 GMC Sierra with OBDII code U184A present, as the communication loss with the Body Control Module can affect critical vehicle functions related to safety and performance.

5. How can I repair OBDII code U184A in my 2018 GMC Sierra?

To repair OBDII code U184A in a 2018 GMC Sierra, you may need to replace the Body Control Module if it is faulty, repair any damaged wiring or connectors in the CAN bus network, clear the fault code with an OBDII scanner, and perform a thorough system reset.

6. Are there any DIY tips for fixing OBDII code U184A in a 2018 GMC Sierra?

While diagnosing and repairing OBDII code U184A may require advanced automotive knowledge and tools, you can start by checking the fuses related to the Body Control Module, inspecting the wiring harness for visible damage, and ensuring all electrical connections are secure.

7. How much does it typically cost to repair OBDII code U184A in a 2018 GMC Sierra?

The cost of repairing OBDII code U184A in a 2018 GMC Sierra can vary depending on the specific cause of the communication loss with the Body Control Module. Costs may include parts such as a new BCM, labor for diagnostics and repairs, and any additional components needed.

8. Will resetting the OBDII code U184A in my 2018 GMC Sierra make it go away permanently?

Resetting the OBDII code U184A in your 2018 GMC Sierra may temporarily clear the fault code, but if the underlying issue causing the communication loss with the Body Control Module is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

9. Can extreme weather conditions contribute to OBDII code U184A appearing in a 2018 GMC Sierra?

Extreme weather conditions such as excessive heat or cold can potentially affect the electrical components and connections in a 2018 GMC Sierra, leading to communication issues with the Body Control Module and triggering OBDII code U184A.

10. Is it necessary to visit a dealership for OBDII code U184A repairs on a 2018 GMC Sierra?

While visiting a dealership with specialized technicians and equipment can be beneficial for diagnosing and repairing OBDII code U184A in a 2018 GMC Sierra, independent automotive repair shops with experience in diagnosing electrical issues may also be able to effectively address the problem.