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U184A 2015 Chevrolet Silverado Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Quick Answer

The U184A diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. Common causes include Faulty wiring harness or connectors, Malfunctioning BCM, ECM software issues. 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 2015 Chevrolet Silverado indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
Common causes
Common causes include Faulty wiring harness or connectors, Malfunctioning BCM, ECM software issues.
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 29, 2024
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Code U184A 2015 Chevrolet Silverado Description

The U184A diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. The BCM is responsible for controlling various body functions such as interior lighting, power windows, door locks, and security systems. The Low Speed CAN Bus is a communication network that allows different modules in the vehicle to exchange information at a slower speed compared to the High Speed CAN Bus.

OBDII Code U184A 2015 Chevrolet Silverado - Lost Communication with Body Control Module on Low Speed CAN Bus
U184A 2015 Chevrolet Silverado Code - Lost Communication with Body Control Module on Low Speed CAN Bus

Common Causes of U184A 2015 Chevrolet Silverado

  1. Faulty wiring harness or connectors.
  2. Malfunctioning BCM.
  3. ECM software issues.
  4. Corrosion or damage to CAN Bus wiring.
  5. Electrical interference from aftermarket accessories.

Symptoms of U184A 2015 Chevrolet Silverado

  1. Non-responsive power windows or door locks.
  2. Interior lights not turning on or off correctly.
  3. Security system malfunctions.
  4. No-start condition.

How to Fix U184A 2015 Chevrolet Silverado

  1. Perform a visual inspection of the wiring harness and connectors for any signs of damage or corrosion.
  2. Use a diagnostic scan tool to check for communication errors between the ECM and BCM.
  3. Test the CAN Bus wiring for continuity and proper voltage levels.
  4. If necessary, replace the BCM or repair any damaged wiring.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix U184A 2015 Chevrolet Silverado

The typical repair costs for addressing a U184A code on a 2015 Chevrolet Silverado can range from $200 to $500, depending on the specific cause of the communication failure and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 2015 Chevrolet Silverado Code

1. What does OBDII code U184A mean on a 2015 Chevrolet Silverado?

The U184A code indicates that there has been a loss of communication with the Body Control Module (BCM) on the Low Speed CAN Bus, suggesting an issue with the network communication path between the BCM and other modules.

2. What are the common symptoms of code U184A in a 2015 Chevrolet Silverado?

Symptoms may include erratic behavior of interior lights, issues with the central locking system, problems with the vehicle’s alarm system, and potential malfunctions in other electronically controlled systems like the audio or navigation system.

3. What can cause the U184A code to appear in a 2015 Chevrolet Silverado?

Causes might include faulty or damaged wiring, a defective Body Control Module, issues with connectors or grounds, or interference from other electronic devices.

4. How do I fix the U184A code in a 2015 Chevrolet Silverado?

To fix this issue, check and repair any damaged wiring, ensure all connectors are clean and secure, replace any faulty components like the BCM if necessary, and clear the code to see if it returns.

5. Is it safe to drive a 2015 Chevrolet Silverado with the U184A code?

While the vehicle might still be drivable, it's important to address the issue promptly as it can affect various electronic systems in the vehicle, potentially leading to more serious problems or safety concerns.

6. How can I prevent the U184A code from occurring in my 2015 Chevrolet Silverado?

Regular maintenance and inspections of the vehicle’s electrical system and ensuring that all firmware updates for the BCM are applied can help in preventing issues related to code U184A.

7. What tools are needed to diagnose the U184A code on a 2015 Chevrolet Silverado?

A professional-grade OBDII scanner, a digital multimeter, and a wiring diagram for the vehicle are essential tools for diagnosing and addressing this error code effectively.

8. Could the U184A code affect the overall performance of my 2015 Chevrolet Silverado?

While the code primarily affects communication functions, unresolved communication issues can lead to performance drops, especially if related systems like the engine or transmission controls are impacted.

9. What should I check first when diagnosing the U184A code in a 2015 Chevrolet Silverado?

Initially, inspect the BCM connectors and wiring for any obvious signs of damage or corrosion. Also, check the grounding points as poor grounds can often cause communication issues.

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