AutoCodes – Generic – U2602

U2602 Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain 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 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: U2602 indicates Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,508

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U2602 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 a high-speed General Motors 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 400 ms, the Battery Energy Control Module increases its fail count. When this fail count is over X Cal Value (7) during Y Cal Value (10 samples), the diagnostic status of this code is set to Failed and transmitted over high voltage energy high-speed GMLAN bus to the Hybrid/EV Powertrain Control Module 2.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received within 400 ms.

OBDII Code U2602 - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U2602 Code - Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2

What does this mean?

What are the Possible Causes of the DTC U2602?

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 U2602?

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 U2602 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 U2602 code?

Need more information on how to fix the U2602 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2602 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2602 Buick — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
U2602 Cadillac — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
U2602 Chevrolet — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
U2602 GMC — Battery Energy Control Module Lost Communication With Hybrid/EV Powertrain 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 U2602 Code

1. What are common symptoms of OBDII code U2602?

The common symptoms of code U2602 include the hybrid or electric vehicle not starting, loss of power, and a dashboard warning light indicating a fault in the battery energy control module communication.

2. What can cause OBDII code U2602 to trigger?

Code U2602 may be triggered by a communication breakdown between the battery energy control module and the hybrid/EV powertrain control module 2. This can be due to damaged wiring, loose connections, or a faulty control module.

3. How can I diagnose the issue related to code U2602?

To diagnose the issue, it is recommended to perform a thorough inspection of the wiring harness, connectors, and modules involved in the communication system. Using a diagnostic scanner to retrieve additional fault codes can also help pinpoint the problem.

4. Can I still drive my vehicle with OBDII code U2602 present?

It is not recommended to drive the vehicle with code U2602 present, as it can lead to further damage and potential safety hazards. It is advised to address the issue promptly to avoid any complications.

5. What are the repair options for OBDII code U2602?

Repair options for code U2602 may include repairing or replacing damaged wiring, ensuring secure connections, and potentially replacing the battery energy control module or the hybrid/EV powertrain control module 2 if deemed necessary.

6. How much does it typically cost to repair OBDII code U2602?

The cost of repairing code U2602 can vary depending on the extent of the damage and the specific components that need to be replaced. It is recommended to consult with a professional mechanic for an accurate estimate.

7. Can a DIY enthusiast fix OBDII code U2602?

While some aspects of diagnosing and addressing code U2602 can be tackled by experienced DIY enthusiasts, it is advisable to seek professional help for a comprehensive and accurate repair. Electrical issues can be complex and require specialized knowledge.

8. How urgent is it to address OBDII code U2602?

It is important to address code U2602 promptly to prevent further complications and potential damage to the vehicle's electrical system. Ignoring the issue can lead to more severe problems down the line.

9. Can extreme weather conditions affect the occurrence of OBDII code U2602?

Extreme weather conditions, especially temperature fluctuations, can potentially impact the occurrence of code U2602 by putting additional stress on the vehicle's electrical components. It is essential to maintain the vehicle properly in all weather conditions.

10. Is there a way to prevent OBDII code U2602 from occurring in the future?

Regular maintenance and inspections of the vehicle's electrical system, including checking wiring harnesses and connectors, can help prevent code U2602 from occurring. Following manufacturer recommendations and addressing any issues promptly can also reduce the risk of this code triggering.