AutoCodes – GMC – U184B 2014 GMC Sierra

U184B 2014 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 2014 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 204

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 2014 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 2014 GMC Sierra - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus - AutoCodes.com — U184B 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What are common symptoms of OBDII code U184B in a 2014 GMC Sierra?

The common symptoms of OBDII code U184B in a 2014 GMC Sierra include issues with the remote heater and air conditioning control module, such as loss of control over the heating and cooling functions.

2. What causes the OBDII code U184B in a 2014 GMC Sierra?

The U184B code is typically triggered when there is a communication failure between the vehicle's low-speed CAN bus and the remote heater and air conditioning control module. This can be caused by wiring issues, a faulty control module, or a problem with the CAN bus network.

3. How can I diagnose the OBDII code U184B in my 2014 GMC Sierra?

Diagnosing the U184B code involves using a professional OBDII scanner to retrieve the specific fault codes present in the vehicle's system. Additionally, a thorough inspection of the wiring connections and the remote heater and air conditioning control module may be necessary.

4. Can I still drive my 2014 GMC Sierra with the U184B fault code?

While the U184B code may not directly affect the drivability of the vehicle, it is important to address the underlying communication issue between the low-speed CAN bus and the control module to prevent further problems with the heating and cooling system.

5. How can I repair the U184B fault code in my 2014 GMC Sierra?

Repairing the U184B fault code may involve checking and repairing any damaged wiring connections, replacing the remote heater and air conditioning control module if necessary, and ensuring proper communication between the CAN bus network and the control module.

6. Is it safe to reset the U184B fault code in my 2014 GMC Sierra using an OBDII scanner?

Resetting the fault code using an OBDII scanner may temporarily clear the warning light, but it is crucial to address the root cause of the communication issue to prevent the code from reoccurring and ensure the proper functioning of the heating and cooling system.

7. Can a DIY enthusiast fix the U184B fault code in a 2014 GMC Sierra?

While basic troubleshooting steps like checking for loose connections or damaged wiring can be performed by a DIY enthusiast, diagnosing and repairing the U184B fault code may require advanced knowledge and specialized tools, so seeking professional assistance is recommended.

8. Does the U184B fault code affect the overall performance of a 2014 GMC Sierra?

The U184B fault code primarily affects the remote heater and air conditioning control module's functionality and does not directly impact the overall performance of the vehicle. However, addressing the code promptly is essential to maintain proper control over the heating and cooling system.

9. How much does it cost to repair the U184B fault code in a 2014 GMC Sierra?

The cost of repairing the U184B fault code in a 2014 GMC Sierra can vary depending on the underlying cause of the communication issue and the extent of repairs needed. It is recommended to obtain a diagnosis from a trusted mechanic to determine the exact cost.

10. Are there any recalls or technical service bulletins related to the U184B fault code in a 2014 GMC Sierra?

It is advisable to check with the manufacturer or a GMC dealership to inquire about any recalls or technical service bulletins related to the U184B fault code in a 2014 Sierra. Keeping up to date with any relevant information can help in addressing the issue effectively.