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Engine-Codes – Generic – U185B

U185B Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus

Quick Answer

The diagnostic code U185B indicates that there is a communication issue between the Battery Energy Control Module (BECM) and the Hybrid/EV Powertrain Control Module 2 on the High Voltage Energy Management CAN Bus. Common causes include Faulty Wiring: Damaged or corroded wiring connecting the BECM and Powertrain Control Module 2 can disrupt communication, Failed Module: A malfunction in either the BECM or Powertrain Control Module 2 can cause communication errors, Software Glitch: A software bug or programming issue within one of the modules can lead to communication failures. 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
U185B indicates Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring connecting the BECM and Powertrain Control Module 2 can disrupt communication, Failed Module: A malfunction in either the BECM or Powertrain Control Module 2 can cause communication errors, Software Glitch: A software bug or programming issue within one of the modules can lead to communication failures.
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 Aug 20, 2024
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Code U185B Description

The diagnostic code U185B indicates that there is a communication issue between the Battery Energy Control Module (BECM) and the Hybrid/EV Powertrain Control Module 2 on the High Voltage Energy Management CAN Bus. This communication error can disrupt the coordination between these two modules, which are crucial for managing the high-voltage energy system in hybrid and electric vehicles. The BECM is responsible for monitoring and controlling the battery's energy levels, while the Powertrain Control Module 2 oversees the hybrid or electric powertrain operation. When communication is lost between these modules, it can lead to performance issues and potentially impact the vehicle's overall drivability.

OBDII Code U185B - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
U185B Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus

Common Causes of U185B

  1. Faulty Wiring: Damaged or corroded wiring connecting the BECM and Powertrain Control Module 2 can disrupt communication.
  2. Failed Module: A malfunction in either the BECM or Powertrain Control Module 2 can cause communication errors.
  3. Software Glitch: A software bug or programming issue within one of the modules can lead to communication failures.
  4. Voltage Spikes: Electrical spikes or fluctuations in the high-voltage energy system can interfere with communication between the modules.

Symptoms of U185B

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Power Output: The vehicle may experience a decrease in power output or acceleration due to the communication error.
  3. Erratic Charging Behavior: The battery may not charge or discharge properly, leading to erratic behavior in the vehicle's energy management system.
  4. Inability to Start: In severe cases, the vehicle may not start at all if the communication issue persists.

How to Fix U185B

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific codes and pinpoint the source of the communication problem.
  2. Inspect Wiring: Check the wiring harness between the BECM and Powertrain Control Module 2 for any damage or loose connections.
  3. Test Modules: Test the functionality of both the BECM and Powertrain Control Module 2 to determine if either module needs to be replaced.
  4. Update Software: If a software glitch is suspected, update the software in both modules to ensure proper communication.
  5. Clear Codes: After repairing the issue, clear the diagnostic trouble codes and reset the system to see if the problem has been resolved.

Cost to Fix U185B

The typical repair costs for addressing a communication issue between the BECM and Powertrain Control Module 2 can range from $200 to $800, depending on the specific cause of the problem and the labor rates in your area. This estimate includes the cost of potential parts replacement, diagnostic time, and labor fees. Keep in mind that prices may vary based on the vehicle's make and model, as well as the location and type of repair shop. It's recommended to consult with a professional mechanic for an accurate cost estimate tailored to your situation.

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Code U185B Information for Specific Makes

  • U185B Buick — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
  • U185B Cadillac — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
  • U185B Chevrolet — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
  • U185B GMC — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 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 U185B Code

1. What are common symptoms of OBDII code U185B?

- Common symptoms include check engine light illumination, reduced hybrid/EV powertrain performance, and potential drivability issues.

2. What are possible causes of U185B code?

- Possible causes include faulty battery energy control module, issues with the hybrid/EV powertrain control module 2, wiring problems, or communication network errors.

3. How can I diagnose the U185B code?

- Diagnosis involves using a scan tool to retrieve the code, checking for other related codes, inspecting the high voltage energy management CAN bus for faults, and testing the communication between modules.

4. What should I do if I encounter the U185B code?

- If you encounter the U185B code, it is recommended to have the vehicle diagnosed by a professional technician to pinpoint the exact cause of the communication issue and ensure proper repair.

5. Can I continue driving with the U185B code present?

- It is not recommended to continue driving with the U185B code present, as it can lead to further damage to the hybrid/EV powertrain components and potentially affect the vehicle's performance and safety.

6. How can I repair the U185B code?

- Repairing the U185B code may involve fixing wiring issues, replacing faulty modules, reprogramming modules if necessary, and clearing the code from the vehicle's computer system.

7. Are there any specific precautions to take when dealing with the U185B code?

- When dealing with the U185B code, it is important to follow proper safety procedures for working with high voltage components in hybrid/EV vehicles and to consult a qualified technician for assistance.

8. Can a DIY enthusiast repair the U185B code?

- Repairing the U185B code may require specialized knowledge and tools related to hybrid/EV systems, so it is recommended to seek professional help unless the individual has experience working on such systems.

9. How long does it typically take to repair the U185B code?

- The time to repair the U185B code can vary depending on the specific cause of the issue, availability of parts, and the complexity of the repair. It is best to consult with a technician for an accurate estimate.

10. Is the U185B code a common issue in hybrid/EV vehicles?

- The U185B code is not extremely common but can occur in hybrid/EV vehicles due to communication issues between modules on the high voltage energy management CAN bus.

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