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Engine-Codes – Generic – U185A

U185A Code - Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus

Quick Answer

The diagnostic trouble code U185A indicates that there has been a communication failure with the Battery Energy Control Module (BECM) on the High Voltage Energy Management Controller Area Network (CAN) bus. Common causes include Faulty Battery Energy Control Module, Wiring or connection issues in the High Voltage Energy Management CAN bus, Software glitch in the BECM. 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
U185A indicates Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus.
Common causes
Common causes include Faulty Battery Energy Control Module, Wiring or connection issues in the High Voltage Energy Management CAN bus, Software glitch in the BECM.
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 11, 2024
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Code U185A Description

The diagnostic trouble code U185A indicates that there has been a communication failure with the Battery Energy Control Module (BECM) on the High Voltage Energy Management Controller Area Network (CAN) bus. The BECM is responsible for managing the high voltage energy system in hybrid and electric vehicles. When communication is lost with this module, it can lead to various issues with the vehicle's performance and overall functionality.

OBDII Code U185A - Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
U185A Code - Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus

Common Causes of U185A

  1. Faulty Battery Energy Control Module.
  2. Wiring or connection issues in the High Voltage Energy Management CAN bus.
  3. Software glitch in the BECM.
  4. Communication network disruption.
  5. Water or corrosion damage to electrical components.

Symptoms of U185A

  1. Check engine light illuminated on the dashboard.
  2. Loss of power or acceleration.
  3. Inability to start the vehicle.
  4. Erratic behavior of the high voltage energy system.
  5. Vehicle going into a limp mode.

How to Fix U185A

  1. Perform a comprehensive diagnostic scan to identify the exact cause of the communication failure.
  2. Inspect the wiring and connections in the High Voltage Energy Management CAN bus for any damage or corrosion.
  3. Test the Battery Energy Control Module for functionality and replace if necessary.
  4. Clear the diagnostic trouble code and reset the system to ensure proper communication.
  5. Conduct a test drive to verify that the issue has been resolved and that the high voltage energy system is functioning correctly.

Cost to Fix U185A

The typical repair costs for addressing a lost communication with the Battery Energy Control Module on the High Voltage Energy Management CAN bus can vary depending on the specific cause of the issue. On average, the repair cost for this type of problem can range from $200 to $800, including parts and labor. However, it's essential to note that the actual cost can be higher or lower based on factors such as location, vehicle make and model, and the extent of the repair needed. Additionally, diagnostic time and labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. It is recommended to consult with a professional mechanic to get an accurate estimate for your specific situation.

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Code U185A Information for Specific Makes

  • U185A Buick — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
  • U185A Cadillac — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
  • U185A Chevrolet — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
  • U185A GMC — Lost Communication With Battery Energy Control Module On High Voltage Energy Management 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 U185A Code

1. What are common symptoms of OBDII code U185A?

- Common symptoms include loss of communication with the battery energy control module, warning lights illuminated on the dashboard, and potential drivability issues.

2. What does the OBDII code U185A indicate?

- The code U185A indicates that there is a communication problem between the vehicle's control modules and the battery energy control module on the high voltage energy management CAN bus.

3. What are possible causes of code U185A?

- Possible causes include a faulty battery energy control module, wiring or connection issues in the high voltage energy management CAN bus, or a malfunctioning control module in the vehicle.

4. How can I diagnose the U185A code?

- Diagnosing the U185A code typically involves using a professional OBDII scanner to retrieve the code, checking for any additional related codes, and performing a thorough inspection of the high voltage energy management system components.

5. Can I still drive my vehicle with code U185A present?

- It is not recommended to drive your vehicle with the U185A code present, as it may lead to further damage to the high voltage energy management system and potentially affect the drivability and safety of the vehicle.

6. How can I repair the U185A code?

- Repairing the U185A code may involve addressing the root cause of the communication issue, such as replacing the battery energy control module, repairing damaged wiring or connections, or reprogramming control modules as needed.

7. Is it safe to attempt repairs for code U185A on my own?

- Due to the high voltage nature of the energy management system, it is recommended to seek assistance from a qualified technician or dealership when dealing with the U185A code to ensure safety and proper repairs.

8. Will resetting the code U185A make it go away permanently?

- Resetting the code U185A may temporarily clear the warning lights, but if the underlying issue causing the communication problem is not addressed, the code is likely to return.

9. Can extreme weather conditions cause code U185A to appear?

- Extreme weather conditions can potentially affect the high voltage energy management system and lead to communication issues, which may trigger the U185A code.

10. How can I prevent OBDII code U185A from reoccurring?

- To prevent the U185A code from reoccurring, it is important to perform regular maintenance on the high voltage energy management system, address any wiring or connection issues promptly, and follow manufacturer recommendations for system checks and updates.

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