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
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 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 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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.
Need more information about the U185B GMC code?
Need more information on how to fix the U185B GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U185B GMC code diagnosed by a professional: Find a repair shop in your area
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.
Discuss the causes and fixes for U185B GMC OBDII Code
Code U185B GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
