AutoCodes – GMC – U184B 2016 GMC Sierra

U184B 2016 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 2016 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 168

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 2016 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 2016 GMC Sierra - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus - AutoCodes.com — U184B 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code U184B in a 2016 GMC Sierra?

- Common symptoms include loss of communication with the remote heater and air conditioning control module, resulting in issues with controlling the vehicle's heating and air conditioning system.

2. What can cause the OBDII code U184B to appear in a 2016 GMC Sierra?

- The code U184B typically indicates a communication problem on the low-speed Controller Area Network (CAN) bus between the vehicle's onboard computer and the remote heater and air conditioning control module.

3. How can I diagnose the root cause of the U184B code in my 2016 GMC Sierra?

- Diagnosing the U184B code may require checking the wiring connections, inspecting for damaged wires or connectors, and verifying the proper functioning of the remote heater and air conditioning control module.

4. Is it safe to continue driving my 2016 GMC Sierra with the U184B code present?

- It is not recommended to continue driving the vehicle with the U184B code active, as it may lead to further issues with the heating and air conditioning system and potentially affect overall vehicle performance.

5. What are some repair tips for fixing the U184B code in a 2016 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, resetting the code with a diagnostic tool, and testing the heating and air conditioning system for functionality.

6. Can the U184B code be cleared/reset without fixing the underlying issue in a 2016 GMC Sierra?

- While the code can be cleared temporarily using a diagnostic tool, it is essential to address the root cause of the communication problem to prevent the code from reoccurring.

7. How much does it typically cost to repair the U184B code in a 2016 GMC Sierra?

- Repair costs for the U184B code can vary depending on the extent of the issue, but they may involve labor costs for diagnosis and repair, as well as potential expenses for replacement parts or components.

8. Will resetting the vehicle's battery clear the U184B code in a 2016 GMC Sierra?

- Resetting the vehicle's battery may temporarily clear the code, but if the underlying communication issue persists, the code is likely to reappear once the system detects the problem again.

9. Can a DIY enthusiast fix the U184B code issue in a 2016 GMC Sierra?

- Depending on the individual's skill level and access to tools and resources, some DIY enthusiasts may be able to diagnose and repair the U184B code, but it is recommended to seek professional help for more complex issues.

10. How can I prevent the U184B code from reoccurring in my 2016 GMC Sierra?

- To prevent the U184B code from reoccurring, it is essential to address any underlying communication issues promptly, perform regular maintenance checks on the vehicle's systems, and follow proper diagnostic procedures when dealing with related problems.