AutoCodes – Chevrolet – U184B 2018 Chevrolet Silverado

U184B 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 189

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U184B 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus - AutoCodes.com — U184B 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 U184B 2018 Chevrolet Silverado code?

Need more information on how to fix the U184B 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U184B 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

1. What are common symptoms of OBDII code U184B on a 2018 Chevrolet Silverado?

Common symptoms include loss of communication with the remote heater and air conditioning control module, malfunctioning HVAC controls, and issues with climate control settings.

2. What can cause the OBDII code U184B on a 2018 Chevrolet Silverado?

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

3. How can I diagnose the U184B trouble code on my 2018 Chevrolet Silverado?

To diagnose the U184B code, it's recommended to perform a thorough inspection of the wiring harness, connectors, and modules related to the remote heater and air conditioning system. Checking for loose connections or damaged wiring is crucial.

4. Can a faulty remote heater and air conditioning control module cause the U184B code?

Yes, a malfunctioning remote heater and air conditioning control module can lead to the U184B trouble code due to communication issues over the low-speed CAN bus network.

5. What are some repair tips for fixing the U184B code on a 2018 Chevrolet Silverado?

Repair tips include checking and repairing any damaged wiring, ensuring all connectors are properly connected, and resetting the trouble codes after addressing the underlying communication problem.

6. Is it safe to continue driving with the U184B trouble code present in a 2018 Chevrolet Silverado?

While the vehicle may still be operable with the U184B code, it's recommended to address the communication issue promptly to prevent further complications with the remote heater and air conditioning system.

7. Can the U184B trouble code be cleared without fixing the underlying issue?

Clearing the trouble code without addressing the root cause, such as a communication problem with the remote heater and air conditioning module, may result in the code reappearing once the issue persists.

8. Are there any recalls or technical service bulletins related to the U184B code on a 2018 Chevrolet Silverado?

It's advisable to check with a Chevrolet dealership or refer to the manufacturer's website to see if there are any recalls or technical service bulletins addressing the U184B trouble code specifically for the 2018 Silverado model.

9. How can I prevent the U184B trouble code from reoccurring on my 2018 Chevrolet Silverado?

Regular maintenance, including checking the integrity of wiring and connectors related to the remote heater and air conditioning control module, can help prevent the U184B trouble code from reoccurring in the future.

10. Is it necessary to visit a dealership for repairs related to the U184B code on a 2018 Chevrolet Silverado?

While it's recommended to seek professional assistance for diagnosing and repairing the U184B trouble code, independent automotive repair shops with experience in handling Chevrolet vehicles may also be able to address the issue effectively.