AutoCodes – Generic – U185A

U185A Code - Lost Communication With Battery Energy Control Module 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 Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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: U185A indicates Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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 1,866

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 U185A 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. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received for more than 500 ms.

OBDII Code U185A - Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus - AutoCodes.com — U185A Code - Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus

What does this mean?

What are the Possible Causes of the DTC U185A?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC U185A?

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 U185A 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 U185A code?

Need more information on how to fix the U185A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U185A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U185A Buick — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
U185A Cadillac — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
U185A Chevrolet — Lost Communication With Battery Energy Control Module On High Voltage Energy Management CAN Bus
U185A GMC — Lost Communication With Battery Energy Control Module 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 U185A Code

1. What are common symptoms of OBDII code U185A?

- Common symptoms include loss of communication with the battery energy control module, warning lights illuminated on the dashboard, and potential drivability issues.

2. What does the OBDII code U185A indicate?

- The code U185A indicates that there is a communication problem between the vehicle's control modules and the battery energy control module on the high voltage energy management CAN bus.

3. What are possible causes of code U185A?

- Possible causes include a faulty battery energy control module, wiring or connection issues in the high voltage energy management CAN bus, or a malfunctioning control module in the vehicle.

4. How can I diagnose the U185A code?

- Diagnosing the U185A code typically involves using a professional OBDII scanner to retrieve the code, checking for any additional related codes, and performing a thorough inspection of the high voltage energy management system components.

5. Can I still drive my vehicle with code U185A present?

- It is not recommended to drive your vehicle with the U185A code present, as it may lead to further damage to the high voltage energy management system and potentially affect the drivability and safety of the vehicle.

6. How can I repair the U185A code?

- Repairing the U185A code may involve addressing the root cause of the communication issue, such as replacing the battery energy control module, repairing damaged wiring or connections, or reprogramming control modules as needed.

7. Is it safe to attempt repairs for code U185A on my own?

- Due to the high voltage nature of the energy management system, it is recommended to seek assistance from a qualified technician or dealership when dealing with the U185A code to ensure safety and proper repairs.

8. Will resetting the code U185A make it go away permanently?

- Resetting the code U185A may temporarily clear the warning lights, but if the underlying issue causing the communication problem is not addressed, the code is likely to return.

9. Can extreme weather conditions cause code U185A to appear?

- Extreme weather conditions can potentially affect the high voltage energy management system and lead to communication issues, which may trigger the U185A code.

10. How can I prevent OBDII code U185A from reoccurring?

- To prevent the U185A code from reoccurring, it is important to perform regular maintenance on the high voltage energy management system, address any wiring or connection issues promptly, and follow manufacturer recommendations for system checks and updates.