U185B Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
Quick Answer
Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection. 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 Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection.
- 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.
Code U185B Description
This diagnostic is used to check the loss of communication with the Hybrid/EV Powertrain Control Module 2 on high voltage energy management high-speed General Motor Local Area Network (GMLAN) bus. The Battery Energy Control Module supervises a periodic serial data message to check the communication status of the Hybrid/EV Powertrain Control Module 2. If this message is not received within 1 s, this Diagnostic Trouble Code (DTC) is set.
What are the Possible Causes of the DTC U185B?
- Faulty Hybrid/EV Powertrain Control Module 2
- Hybrid/EV Powertrain Control Module 2 harness is open or shorted
- Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection
How to Fix the DTC U185B?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U185B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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
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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