AutoCodes – GMC – U184A GMC

U184A GMC 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 GMC 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.

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Code Popularity 519

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

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 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 U184A 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.

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Information for Specific GMC Models

U184A 2014 GMC Sierra — Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2015 GMC Sierra — Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2016 GMC Sierra — Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2017 GMC Sierra — Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2018 GMC Sierra — Lost Communication with Body Control Module 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 U184A GMC Code

1. What are the common symptoms of OBDII code U184A GMC (Lost Communication with Body Control Module on Low Speed CAN Bus)?

- Common symptoms include issues with various body control functions such as power windows, interior lights, central locking, and HVAC systems.

2. What can cause the OBDII code U184A GMC to appear?

- The code U184A is typically triggered by a poor electrical connection, damaged wiring, or a faulty Body Control Module (BCM) on the low-speed Controller Area Network (CAN) bus.

3. How can I diagnose the OBDII code U184A GMC?

- Diagnosis involves checking the wiring harness and connectors related to the Body Control Module, performing a visual inspection for any visible damage, and using a diagnostic scan tool to communicate with the BCM.

4. What are some repair tips for resolving the U184A GMC code?

- Start by checking and repairing any damaged wiring or connectors in the low-speed CAN bus system. If the issue persists, consider replacing the Body Control Module after proper diagnosis.

5. Can the U184A GMC code be cleared with a simple reset?

- Clearing the code with a reset may temporarily remove the warning light, but if the underlying issue with the communication on the low-speed CAN bus is not addressed, the code is likely to reappear.

6. Is it safe to continue driving with the U184A GMC code present?

- It is not recommended to ignore the U184A code, as it indicates a communication problem with essential control modules. Continued driving with this issue unresolved may lead to further electrical malfunctions.

7. How much does it typically cost to repair the U184A GMC code?

- The cost of repairing the U184A code can vary depending on the extent of the issue and whether it requires simple wiring repairs or a BCM replacement. Costs can range from a few hundred to over a thousand dollars.

8. Can I fix the U184A GMC code myself, or do I need a professional mechanic?

- While simple wiring checks and repairs can be done by DIY enthusiasts, diagnosing and replacing the Body Control Module often requires advanced technical skills and specialized equipment, so consulting a professional mechanic is recommended.

9. Are there any recalls or technical service bulletins related to the U184A GMC code?

- It is advisable to check with GMC dealerships or online resources for any recalls or technical service bulletins specific to the U184A code for your vehicle model and year.

10. How can I prevent the U184A GMC code from reoccurring in the future?

- To prevent the U184A code from appearing again, it is essential to maintain the electrical system of your vehicle, regularly check for loose connections or damaged wiring, and address any related issues promptly to ensure proper communication on the low-speed CAN bus.