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U184A 2018 Chevrolet Silverado Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Quick Answer

The diagnostic trouble code U184A for a 2018 Chevrolet Silverado indicates that there is a communication issue with the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. Common causes include Faulty Body Control Module, Wiring or connection issues in the CAN Bus network, Corrosion or damage to the BCM connectors. 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
U184A 2018 Chevrolet Silverado indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
Common causes
Common causes include Faulty Body Control Module, Wiring or connection issues in the CAN Bus network, Corrosion or damage to the BCM connectors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code U184A 2018 Chevrolet Silverado Description

The diagnostic trouble code U184A for a 2018 Chevrolet Silverado indicates that there is a communication issue with the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. The BCM is a crucial component of the vehicle's electrical system, responsible for controlling various functions such as interior lighting, power windows, door locks, and more. The Low Speed CAN Bus is a network that allows different modules within the vehicle to communicate with each other at a lower speed compared to the High Speed CAN Bus.

OBDII Code U184A 2018 Chevrolet Silverado - Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2018 Chevrolet Silverado Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Common Causes of U184A 2018 Chevrolet Silverado

  1. Faulty Body Control Module.
  2. Wiring or connection issues in the CAN Bus network.
  3. Corrosion or damage to the BCM connectors.
  4. Electrical interference or noise affecting communication on the CAN Bus.
  5. Software glitches or programming errors in the BCM.

Symptoms of U184A 2018 Chevrolet Silverado

  1. Non-functional power windows or door locks.
  2. Interior lights not working properly.
  3. Erratic behavior of dashboard warning lights.
  4. Issues with the vehicle's remote keyless entry system.
  5. Malfunctioning turn signals or exterior lighting.

How to Fix U184A 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the BCM and its connectors for any visible damage or corrosion.
  2. Check the wiring harness and connections related to the Low Speed CAN Bus for any loose connections or breaks.
  3. Perform a diagnostic scan to identify the specific communication issue and reset the BCM if necessary.
  4. Update the BCM software to the latest version to address any potential programming errors.
  5. If needed, replace the Body Control Module with a new unit and reprogram it to ensure proper communication with other modules.

Cost to Fix U184A 2018 Chevrolet Silverado

The typical repair costs for addressing the U184A code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, replacing a faulty Body Control Module can range from $300 to $600, including parts and labor. However, additional costs may apply if there are wiring or connection issues that need to be repaired. It is recommended to consult with a professional mechanic or dealership to get an accurate estimate based on the specific diagnosis and repair required. Keep in mind that labor rates can vary between different auto repair shops, so it's advisable to inquire about rates in your local area for a more precise cost estimate.

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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 U184A 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U184A in a 2018 Chevrolet Silverado?

The common symptoms include issues with power windows, door locks, interior lights, and other body control functions not working properly.

2. What can cause the U184A code in a 2018 Chevrolet Silverado?

The U184A code is typically triggered by a communication error between the Body Control Module (BCM) and the Low Speed Controller Area Network (CAN) bus.

3. How can I diagnose the U184A code on a 2018 Chevrolet Silverado?

Diagnosing the U184A code requires using a diagnostic scanner to communicate with the vehicle's BCM and checking for any stored fault codes related to the communication error.

4. What are some potential repair tips for fixing the U184A code in a 2018 Chevrolet Silverado?

Repairing the U184A code may involve checking the wiring harness connections for any loose or damaged wires, resetting the BCM, or replacing the BCM if necessary.

5. Can the U184A code in a 2018 Chevrolet Silverado be fixed without professional help?

While some basic troubleshooting steps can be taken by DIY enthusiasts, resolving the U184A code may require advanced diagnostic tools and expertise, so seeking professional help is recommended.

6. Is it safe to continue driving a 2018 Chevrolet Silverado with the U184A code present?

It is not recommended to drive the vehicle with the U184A code active, as it can lead to further electrical issues and affect the overall functionality of important body control systems.

7. Will resetting the U184A code make it go away permanently in a 2018 Chevrolet Silverado?

Resetting the code may temporarily clear the fault, but if the underlying communication issue between the BCM and the Low Speed CAN bus is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair the U184A code in a 2018 Chevrolet Silverado?

The cost of repairing the U184A code can vary depending on the extent of the issue, the need for parts replacement, and labor costs at a repair shop. It's advisable to get a professional diagnosis for an accurate estimate.

9. Can extreme weather conditions contribute to triggering the U184A code in a 2018 Chevrolet Silverado?

Extreme weather conditions, such as excessive heat or moisture, can potentially affect the electrical connections and components, leading to communication errors and the activation of the U184A code.

10. Are there any recalls or service bulletins related to the U184A code in a 2018 Chevrolet Silverado?

It's recommended to check with a Chevrolet dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or service bulletins related to the U184A code in the 2018 Silverado.

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