AutoCodes – GMC – U184A 2017 GMC Sierra

U184A 2017 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 2017 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.

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Code Popularity 173

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 U184A 2017 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 2017 GMC Sierra - Lost Communication with Body Control Module on Low Speed CAN Bus - AutoCodes.com — U184A 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra code?

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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 U184A 2017 GMC Sierra Code

What does the OBDII code U184A mean for a 2017 GMC Sierra?

The code U184A indicates a loss of communication with the Body Control Module (BCM) on the Low-Speed CAN Bus, typically due to a communication failure or network issue.

What are common symptoms of the U184A code in a 2017 GMC Sierra?

Symptoms may include malfunctioning interior electronics, such as power windows or door locks, dashboard warning lights, or issues with the vehicleâ€™s lighting system.

What causes the U184A code to appear?

Common causes include a faulty BCM, damaged or corroded wiring, loose or broken connectors, or issues with the Low-Speed CAN Bus network.

Can a weak battery cause the U184A code in a 2017 GMC Sierra?

Yes, a weak or failing battery can cause communication issues, leading to the U184A code. Ensuring proper battery voltage is critical.

How do I diagnose the U184A code?

Start by inspecting the wiring and connectors related to the BCM and Low-Speed CAN Bus. Use a diagnostic scanner to verify communication between modules and check for additional codes.

Can I drive my 2017 GMC Sierra with the U184A code active?

While the vehicle may still be drivable, issues with the BCM could affect safety-related systems like lighting or door locks, so itâ€™s best to address the problem promptly.

How do I fix the U184A code on my GMC Sierra?

Repairs may involve replacing damaged wiring, cleaning corroded connectors, reprogramming the BCM, or replacing the BCM if itâ€™s faulty.

Does the U184A code always require BCM replacement?

No, BCM replacement is only necessary if the module is confirmed to be defective. Often, wiring or connection issues are the root cause.

How much does it cost to repair the U184A code on a 2017 GMC Sierra?

Repair costs vary depending on the issue. Diagnosing and fixing wiring or connectors may cost $100-$300, while replacing the BCM could exceed $500, including parts and labor.

Can a software update resolve the U184A code?

In some cases, a software update for the BCM or related modules may resolve communication issues, but this depends on the specific circumstances of the fault.