AutoCodes – Chevrolet – U184B Chevrolet

U184B Chevrolet 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 Chevrolet 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 1,014

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 Chevrolet 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 Chevrolet - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus - AutoCodes.com — U184B Chevrolet 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 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Models

U184B 2014 Chevrolet Silverado — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
U184B 2015 Chevrolet Silverado — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
U184B 2016 Chevrolet Silverado — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
U184B 2017 Chevrolet Silverado — Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
U184B 2018 Chevrolet Silverado — Lost Communication with Remote Heater and Air Conditioning 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 U184B Chevrolet Code

1. What are the common symptoms of OBDII code U184B for a Chevrolet indicating lost communication with the Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus?

- Common symptoms include the inability to control the heater or air conditioning system from the remote, lack of response from the system, and potential issues with temperature regulation in the vehicle.

2. What are the possible causes of the U184B code in a Chevrolet related to lost communication with the Remote Heater and Air Conditioning Control Module?

- Possible causes can include a faulty control module, damaged wiring or connectors, low battery voltage, or issues with the CAN bus communication network.

3. How can I diagnose the U184B code in my Chevrolet for lost communication with the Remote Heater and Air Conditioning Control Module?

- Diagnosis typically involves checking the wiring and connectors for damage, testing the control module for functionality, and using a scan tool to analyze communication on the CAN bus network.

4. What are some repair tips for addressing the U184B code in a Chevrolet?

- Repair tips may include inspecting and repairing any damaged wiring or connectors, replacing the Remote Heater and Air Conditioning Control Module if necessary, ensuring proper battery voltage, and performing a thorough system reset.

5. Can I drive my Chevrolet with the U184B code indicating lost communication with the Remote Heater and Air Conditioning Control Module?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential discomfort from a malfunctioning heater or air conditioning system.

6. Is it possible to reset the U184B code in a Chevrolet without professional help?

- In some cases, the code may clear on its own after addressing the underlying issue. However, using a scan tool to reset the code and perform a system reset is the most effective way to clear it.

7. How much does it typically cost to repair the U184B code in a Chevrolet for lost communication with the Remote Heater and Air Conditioning Control Module?

- Repair costs can vary depending on the specific issue causing the code, but expenses may include parts replacement, labor charges, and diagnostic fees. It is recommended to obtain quotes from reputable automotive technicians.

8. Are there any preventive measures to avoid encountering the U184B code in a Chevrolet in the future?

- Regular maintenance, such as checking the condition of wiring and connectors, ensuring proper battery health, and monitoring system functionality, can help prevent issues leading to the U184B code.