AutoCodes – GMC – U184B 2015 GMC Sierra

U184B 2015 GMC Sierra Code - Lost Communication with Remote Heater and Air Conditioning 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 Heating, Ventilation, and Air Conditioning (HVAC) Control Module, Heating, Ventilation, and Air Conditioning Control Module harness is open or shorted, Heating, Ventilation, and Air Conditioning 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: U184B 2015 GMC Sierra indicates Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus.
Common causes: Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, Heating, Ventilation, and Air Conditioning Control Module harness is open or shorted, Heating, Ventilation, and Air Conditioning 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 200

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U184B 2015 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 U184B 2015 GMC Sierra - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus - AutoCodes.com — U184B 2015 GMC Sierra Code - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U184B 2015 GMC Sierra?

Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
Heating, Ventilation, and Air Conditioning Control Module harness is open or shorted
Heating, Ventilation, and Air Conditioning Control Module circuit poor electrical connection

How to Fix the DTC U184B 2015 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 U184B 2015 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.

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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 U184B 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code U184B in a 2015 GMC Sierra?

- Common symptoms include loss of communication with the remote heater and air conditioning control module, issues with climate control functions, and possible illumination of the check engine light.

2. What could cause the OBDII code U184B to appear in a 2015 GMC Sierra?

- The code U184B is typically triggered by a communication error between the vehicle's low-speed CAN bus network and the remote heater and air conditioning control module.

3. How can I diagnose the issue related to the U184B code in my 2015 GMC Sierra?

- To diagnose the problem, you may need a professional diagnostic scan tool to communicate with the vehicle's onboard computer system and pinpoint the exact source of the communication breakdown.

4. Can a DIY enthusiast repair the U184B code issue in a 2015 GMC Sierra?

- While some basic troubleshooting steps can be taken, resolving the U184B code may require advanced knowledge of automotive electronics and diagnostic equipment, so it's recommended to seek professional help.

5. Are there any quick repair tips for addressing the U184B code in a 2015 GMC Sierra?

- Quick repair tips may include checking for loose or damaged wiring connections, ensuring proper ground connections, and inspecting the remote heater and air conditioning control module for any visible issues.

6. What are the potential risks of ignoring the U184B code in a 2015 GMC Sierra?

- Ignoring the U184B code could lead to continued issues with the remote heater and air conditioning control module, affecting the vehicle's climate control system and potentially causing discomfort while driving.

7. Is it safe to continue driving my 2015 GMC Sierra with the U184B code present?

- While the vehicle may still be operable with the U184B code, it's advisable to address the underlying communication issue promptly to prevent any further complications or failures in the climate control system.

8. How much does it typically cost to repair the U184B code issue in a 2015 GMC Sierra?

- Repair costs for the U184B code can vary depending on the exact cause of the communication problem, so it's best to consult a professional technician for an accurate diagnosis and cost estimate.

9. Can extreme weather conditions contribute to triggering the U184B code in a 2015 GMC Sierra?

- Extreme temperatures or weather conditions may potentially impact the performance of the remote heater and air conditioning control module, leading to communication errors and the appearance of the U184B code.

10. Is the U184B code a common issue in 2015 GMC Sierra vehicles?

- While the U184B code may not be as common as some other OBDII codes, it can still occur in 2015 GMC Sierra models due to various factors affecting the communication network between components.