AutoCodes – Cadillac – U185C Cadillac

U185C Cadillac 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 Cadillac 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 536

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

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 Cadillac?

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 Cadillac 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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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 Cadillac Code

1. What are common symptoms of OBDII code U185C in a Cadillac related to Battery Charger Control Module communication loss with Hybrid/EV Powertrain Control Module 2?

- Common symptoms include loss of power to the battery charger, inability to charge the high voltage battery, and potential drivability issues.

2. What are possible causes of the U185C code in a Cadillac?

- Possible causes include a faulty Battery Charger Control Module, issues with the Hybrid/EV Powertrain Control Module 2, wiring issues, or a communication bus malfunction.

3. How can I diagnose the U185C code in my Cadillac?

- Diagnosing the U185C code typically involves using a professional OBDII scanner to check for codes and communicate with the affected modules. It may also require inspecting the wiring and connections related to the Battery Charger Control Module and Hybrid/EV Powertrain Control Module 2.

4. Can I drive my Cadillac with the U185C code present?

- It is not recommended to drive your Cadillac with the U185C code present, as it can lead to potential issues with charging the high voltage battery and affect the drivability of the vehicle.

5. How can I repair the U185C code in my Cadillac?

- Repairing the U185C code may involve addressing the underlying cause, such as replacing a faulty Battery Charger Control Module or repairing wiring issues. It is recommended to consult with a professional mechanic for proper diagnosis and repair.

6. Is the U185C code a common issue in Cadillac vehicles?

- The U185C code related to Battery Charger Control Module communication loss with Hybrid/EV Powertrain Control Module 2 is not extremely common, but it can occur in Cadillac vehicles equipped with hybrid or electric powertrains.

7. Can a DIY enthusiast fix the U185C code in a Cadillac?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the U185C code may require specialized tools and expertise. It is best to consult with a professional mechanic for accurate diagnosis and repair.

8. Will resetting the OBDII system clear the U185C code in my Cadillac?

- Resetting the OBDII system may temporarily clear the U185C code, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the code to prevent further issues.

9. Are there any safety concerns associated with the U185C code in a Cadillac?

- Since the U185C code relates to communication loss between critical modules in the high voltage energy management system, there may be safety concerns such as potential inability to charge the battery or drive the vehicle in electric mode. It is important to address the issue promptly.

10. How much does it typically cost to repair the U185C code in a Cadillac?

- The cost of repairing the U185C code can vary depending on the underlying cause and the labor rates of the repair shop. It is recommended to obtain a diagnosis and repair estimate from a trusted mechanic before proceeding with any repairs.