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Engine-Codes – GMC – U185B GMC

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

Quick Answer

The U185B diagnostic trouble code (DTC) for GMC vehicles indicates that the Battery Energy Control Module (BECM) has lost communication with the Hybrid/EV Powertrain Control Module 2 (PCM2) on the High Voltage Energy Management Controller Area Network (CAN) Bus. Common causes include Faulty wiring or connectors in the High Voltage Energy Management CAN Bus, Malfunctioning Battery Energy Control Module, Malfunctioning Hybrid/EV Powertrain Control Module 2. 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 GMC 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 or connectors in the High Voltage Energy Management CAN Bus, Malfunctioning Battery Energy Control Module, Malfunctioning Hybrid/EV Powertrain Control Module 2.
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 12, 2024
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Code U185B GMC Description

The U185B diagnostic trouble code (DTC) for GMC vehicles indicates that the Battery Energy Control Module (BECM) has lost communication with the Hybrid/EV Powertrain Control Module 2 (PCM2) on the High Voltage Energy Management Controller Area Network (CAN) Bus. In hybrid or electric vehicles, the BECM is responsible for managing the energy flow between the battery pack and the powertrain, while the PCM2 controls various functions of the hybrid or electric powertrain.

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

  1. Faulty wiring or connectors in the High Voltage Energy Management CAN Bus
  2. Malfunctioning Battery Energy Control Module
  3. Malfunctioning Hybrid/EV Powertrain Control Module 2
  4. Software glitches or communication errors within the modules
  5. Electrical interference or voltage fluctuations in the system

Symptoms of U185B GMC

  1. Check engine light illuminated
  2. Hybrid system warning message displayed
  3. Reduced power output
  4. Decreased fuel efficiency
  5. Drivability issues such as hesitation or rough idle

How to Fix U185B GMC

  1. Perform a thorough diagnostic scan to confirm the U185B code and identify the specific module(s) involved.
  2. Inspect the wiring and connectors in the High Voltage Energy Management CAN Bus for any signs of damage or corrosion.
  3. Test the Battery Energy Control Module and Hybrid/EV Powertrain Control Module 2 for proper function and communication.
  4. Update the software in the affected modules to address any known issues or bugs.
  5. Clear the DTC and reset the system to ensure proper communication between the modules.

Cost to Fix U185B GMC

The typical repair costs for addressing the U185B code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new BECM or PCM2 and labor for diagnosis and repair can range from $300 to $1000 or more. It's essential to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. It's recommended to consult with a qualified technician or service center for a more accurate estimate based on the individual circumstances.

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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 U185B GMC Code

1. What are the common symptoms of OBDII code U185B in a GMC vehicle?

- Common symptoms include the hybrid/EV system malfunction indicator light illuminating, loss of power, and potential difficulty starting the vehicle.

2. What can cause the U185B code to appear in a GMC vehicle?

- The U185B code can be triggered by a communication breakdown between the Battery Energy Control Module and the Hybrid/EV Powertrain Control Module 2 on the high voltage energy management CAN bus.

3. How can I diagnose the U185B code in my GMC vehicle?

- Diagnosis typically involves using a diagnostic scanner to read the code and checking for any loose connections or damaged wiring in the high voltage energy management CAN bus system.

4. Can I still drive my GMC vehicle with the U185B code present?

- It is not recommended to drive the vehicle with the U185B code present, as it can lead to further damage to the hybrid/EV system and potentially cause safety issues.

5. What are some repair tips for fixing the U185B code in a GMC vehicle?

- Repair tips include checking and repairing any damaged wiring, ensuring proper connections in the high voltage energy management CAN bus, and resetting the code after making necessary repairs.

6. Is it safe to attempt to repair the U185B code in my GMC vehicle myself?

- Due to the complex nature of the hybrid/EV system and high voltage components involved, it is recommended to seek professional help or consult the vehicle's service manual before attempting any repairs.

7. How much does it typically cost to repair the U185B code in a GMC vehicle?

- The cost of repairing the U185B code can vary depending on the extent of the damage and the specific components that need to be repaired or replaced. It is advisable to obtain quotes from reputable automotive technicians.

8. Can the U185B code be a recurring issue in a GMC vehicle?

- Without addressing the root cause of the communication breakdown between the Battery Energy Control Module and the Hybrid/EV Powertrain Control Module 2, the U185B code may reappear in the future.

9. Will resetting the code make the U185B issue go away permanently?

- Simply resetting the code without addressing the underlying issue may temporarily clear the code, but the problem is likely to resurface until the communication breakdown is properly diagnosed and repaired.

10. Is the U185B code specific to GMC vehicles only?

- The U185B code related to the Battery Energy Control Module lost communication with the Hybrid/EV Powertrain Control Module 2 on the high voltage energy management CAN bus is specific to GMC vehicles with hybrid or electric powertrains.

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