AutoCodes – Generic – U185C

U185C Code - Battery Charger 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: U185C indicates Battery Charger 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.

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Code Popularity 1,189

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U185C Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
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.

OBDII Code U185C - Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus - AutoCodes.com — U185C Code - Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus

What does this mean?

What are the Possible Causes of the DTC U185C?

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 U185C?

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 U185C 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 U185C code?

Need more information on how to fix the U185C code? Get Access to Factory Service Manuals

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Get the U185C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U185C Buick — Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
U185C Cadillac — Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
U185C Chevrolet — Battery Charger Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On High Voltage Energy Management CAN Bus
U185C GMC — Battery Charger 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 U185C Code

1. What are the common symptoms of OBDII code U185C?

- Common symptoms include check engine light illumination, loss of communication between the battery charger control module and hybrid/EV powertrain control module 2, and potential issues with the high voltage energy management CAN bus.

2. What could cause the Battery Charger Control Module to lose communication with the Hybrid/EV Powertrain Control Module 2?

- Possible causes include damaged wiring or connectors, a faulty battery charger control module, issues with the hybrid/EV powertrain control module 2, or disruptions in the high voltage energy management CAN bus.

3. How can I diagnose the source of the communication loss between modules for code U185C?

- Diagnose by checking for loose or damaged wiring, inspecting connectors for corrosion or bent pins, testing the battery charger control module and hybrid/EV powertrain control module 2 for functionality, and scanning the high voltage energy management CAN bus for faults.

4. Is it safe to drive with OBDII code U185C present?

- It is not recommended to drive with this code present, as communication issues between critical modules can impact the performance and safety of the hybrid/EV system. Seek professional diagnosis and repair promptly.

5. Can a DIY enthusiast repair OBDII code U185C at home?

- Repairing this code may require advanced diagnostic tools and knowledge of hybrid/EV systems. It is advisable to consult a qualified technician or dealership for proper diagnosis and repair to prevent further complications.

6. How much does it typically cost to fix OBDII code U185C?

- The cost of repair can vary depending on the exact cause of the communication loss and the necessary parts or labor involved. Seek estimates from reputable automotive shops or dealerships for accurate pricing.

7. Are there any safety precautions to take when dealing with OBDII code U185C?

- When working on hybrid/EV systems, always follow manufacturer safety guidelines, wear appropriate personal protective equipment, and be cautious around high voltage components to prevent electric shock or injury.

8. Can resetting the OBDII code U185C resolve the communication issue between modules?

- Resetting the code may temporarily clear the fault, but if the underlying issue is not addressed, the code is likely to return. Proper diagnosis and repair are necessary to fix the communication problem permanently.

9. How long does it typically take to repair OBDII code U185C?

- The repair time can vary based on the complexity of the diagnosis and the availability of parts. Some fixes may be completed within a few hours, while others may require more extensive troubleshooting and repair work.

10. Is OBDII code U185C specific to certain vehicle makes and models?

- This code may be specific to hybrid or electric vehicles equipped with the mentioned modules and CAN bus communication system. Consult the vehicle's service manual or a professional technician for model-specific information.