AutoCodes – Generic – U2604

U2604 Code - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Battery Interface Control Module 2, Hybrid/EV Battery Interface Control Module 2 harness is open or shorted, Hybrid/EV Battery Interface 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: U2604 indicates Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module 2, Hybrid/EV Battery Interface Control Module 2 harness is open or shorted, Hybrid/EV Battery Interface 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 2,067

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2604 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 scan tool does not communicate the Hybrid/EV Battery Interface Control Modules 2 on Battery Energy Control Module dedicated bus.
The Diagnostic Trouble Code (DTC) will set when there is no temperature report message from Hybrid/EV Battery Interface Control Modules 2 to Battery Energy Control Module within 4s.

OBDII Code U2604 - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2 - AutoCodes.com — U2604 Code - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2

What does this mean?

What are the Possible Causes of the DTC U2604?

Faulty Hybrid/EV Battery Interface Control Module 2
Hybrid/EV Battery Interface Control Module 2 harness is open or shorted
Hybrid/EV Battery Interface Control Module 2 circuit poor electrical connection
Faulty Battery Energy Control Module

How to Fix the DTC U2604?

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 U2604 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 U2604 code?

Need more information on how to fix the U2604 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2604 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2604 Buick — Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2
U2604 Cadillac — Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2
U2604 Chevrolet — Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2
U2604 GMC — Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 2

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 U2604 Code

1. What are the common symptoms of OBDII code U2604?

- Common symptoms include loss of communication between the Battery Energy Control Module and the Hybrid/EV Battery Interface Control Module 2, resulting in potential issues with the hybrid or electric vehicle system.

2. What are the possible causes of OBDII code U2604?

- Possible causes include loose or damaged wiring connections, a faulty Battery Energy Control Module, a malfunctioning Hybrid/EV Battery Interface Control Module 2, or software issues within the vehicle's system.

3. How can I diagnose OBDII code U2604?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the fault codes, checking the wiring connections for any damage or looseness, and performing a thorough inspection of the Battery Energy Control Module and Hybrid/EV Battery Interface Control Module 2.

4. Can I drive my vehicle with OBDII code U2604?

- It is not recommended to drive the vehicle with this code present, as it may lead to potential issues with the hybrid or electric vehicle system. It is advisable to have the problem diagnosed and repaired promptly.

5. How can I repair OBDII code U2604?

- Repairing this code may involve fixing any damaged wiring connections, replacing the faulty Battery Energy Control Module or Hybrid/EV Battery Interface Control Module 2, or addressing any software issues within the vehicle's system.

6. Is OBDII code U2604 a serious issue?

- Yes, this code should be taken seriously as it indicates a loss of communication between critical components in the hybrid or electric vehicle system, which can impact the vehicle's performance and safety.

7. Can a DIY enthusiast fix OBDII code U2604?

- While diagnosing the issue may be possible for a DIY enthusiast with the right tools and knowledge, repairing OBDII code U2604 often requires professional expertise due to the complex nature of the hybrid or electric vehicle system.

8. How much does it cost to fix OBDII code U2604?

- The cost of fixing this code can vary depending on the underlying cause, the extent of the repairs needed, and whether any components require replacement. It is advisable to consult a professional mechanic for an accurate estimate.

9. Will resetting the OBDII code U2604 make it go away permanently?

- Simply resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed and fixed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

10. Can OBDII code U2604 be prevented?

- While some causes of this code may be due to wear and tear or electronic failures, regular maintenance checks, ensuring proper wiring connections, and timely software updates can help prevent issues that lead to OBDII code U2604.