U184B 2017 GMC Sierra Code - Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus
Quick Answer
The diagnostic trouble code U184B for a 2017 GMC Sierra indicates that there is a communication error with the Remote Heater and Air Conditioning Control Module on the Low Speed Controller Area Network (CAN) bus. Common causes include Faulty Remote Heater and Air Conditioning Control Module, Wiring harness issues or loose connections, Software glitches in the vehicle's communication network. 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 2017 GMC Sierra indicates Lost Communication with Remote Heater and Air Conditioning Control Module on Low Speed CAN Bus.
- Common causes
- Common causes include Faulty Remote Heater and Air Conditioning Control Module, Wiring harness issues or loose connections, Software glitches in the vehicle's communication network.
- 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 U184B 2017 GMC Sierra Description
The diagnostic trouble code U184B for a 2017 GMC Sierra indicates that there is a communication error with the Remote Heater and Air Conditioning Control Module on the Low Speed Controller Area Network (CAN) bus. The CAN bus is a network that allows different modules in the vehicle to communicate with each other. In this case, the Remote Heater and Air Conditioning Control Module is not receiving or sending the necessary data on the network, which can impact the vehicle's heating and air conditioning system.
Common Causes of U184B 2017 GMC Sierra
- Faulty Remote Heater and Air Conditioning Control Module
- Wiring harness issues or loose connections
- Software glitches in the vehicle's communication network
- Faulty Low-Speed CAN bus communication
- Water damage or corrosion in the module connectors
Symptoms of U184B 2017 GMC Sierra
- Inconsistent heating or cooling inside the vehicle
- Unresponsive heater or air conditioning controls
- Incorrect temperature readings on the climate control display
- Heater or air conditioning system not turning on at all
How to Fix U184B 2017 GMC Sierra
- Begin by performing a thorough inspection of the wiring harness and connectors to check for any visible damage or loose connections.
- Use a diagnostic scan tool to communicate with the Remote Heater and Air Conditioning Control Module to check for any stored fault codes and to monitor live data.
- If necessary, replace the Remote Heater and Air Conditioning Control Module with a new unit.
- Clear the fault codes from the vehicle's computer system and perform a relearn procedure to ensure proper communication between modules.
- Test the heater and air conditioning system to verify that the issue has been resolved and that the communication error no longer persists.
Cost to Fix U184B 2017 GMC Sierra
The typical repair costs for addressing a communication error with the Remote Heater and Air Conditioning Control Module on a 2017 GMC Sierra can range from $200 to $500, including parts and labor. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It is advisable to obtain quotes from local shops for a more accurate estimate of the repair costs.
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Frequently Asked Questions about U184B 2017 GMC Sierra Code
1. What does the OBDII code U184B mean for a 2017 GMC Sierra?
The U184B code indicates a loss of communication with the Remote Heater and Air Conditioning Control Module on the low-speed CAN bus.
2. What are the common symptoms of the U184B code on a GMC Sierra?
Common symptoms include malfunctioning HVAC controls, no response from the climate system, or the HVAC system operating in default mode.
3. What causes the U184B code to appear?
Potential causes include a faulty Remote Heater and Air Conditioning Control Module, wiring issues in the low-speed CAN bus, or a software issue in the control module.
4. Can a bad HVAC control module trigger the U184B code?
Yes, a malfunctioning or failed HVAC control module can result in a loss of communication and trigger the U184B code.
5. How can I diagnose the U184B code on my 2017 GMC Sierra?
Diagnosis typically involves scanning for additional codes, inspecting wiring and connections on the low-speed CAN bus, and testing the functionality of the Remote HVAC module.
6. Is the U184B code related to a blown fuse?
Yes, a blown fuse in the circuit powering the HVAC control module can disrupt communication and cause the code to appear.
7. Can software updates fix the U184B code?
In some cases, a software update for the HVAC module or other related control modules can resolve communication issues and clear the code.
8. What tools are needed to repair the U184B code?
You’ll need a diagnostic scanner capable of reading GM-specific codes, a multimeter to check wiring, and potentially a wiring diagram for the low-speed CAN bus system.
9. Is it safe to drive with the U184B code active?
Yes, the vehicle is generally safe to drive, but the HVAC system may not function properly until the issue is resolved.
10. How much does it cost to fix the U184B code on a 2017 GMC Sierra?
Repair costs vary depending on the issue but can range from $100 for minor wiring repairs to $600 or more if the HVAC control module needs replacement.
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