Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that one part of the car's battery system is not working right. It's like when one light switch in your house is stuck and won't turn off.
The code indicates an issue with the battery cell balancing circuit, specifically that it is stuck in the 'on' position.
In hybrid and electric vehicles, the battery management system (BMS) ensures that all battery cells are balanced, meaning they have the same charge level. Circuit J is responsible for balancing a specific group of cells. If this circuit is stuck on, it could lead to overcharging or discharging of cells, potentially causing damage.
• Warning light on the dashboard
• Reduced battery performance
• Possible overheating of the battery
• Faulty battery cell balancing circuit
• Damaged wiring or connectors
• Malfunctioning battery management system
Battery Management System (BMS): A system that manages the battery pack, ensuring optimal performance and longevity.
Cell Balancing: The process of ensuring all cells in a battery pack have the same charge level.
• Check for any other related error codes
• Inspect the wiring and connectors of the battery management system
• Test the battery cell balancing circuit for proper operation
• Replace the faulty battery cell balancing circuit
• Repair or replace damaged wiring or connectors
• Update or reprogram the battery management system
• OBD-II scanner
• Multimeter
• Battery management system diagnostic tool
$200 - $800
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance of the battery system
• Avoiding extreme temperatures
• Ensuring proper charging practices
Battery Management System Issue
• Avoid driving until the issue is resolved to prevent further damage.
• Consult with a certified hybrid/EV technician.
Check if the vehicle's battery system is still under warranty, as repairs might be covered.
This code has become more common as hybrid and electric vehicles have increased in popularity and complexity.
High – This issue can lead to battery damage if not addressed promptly.
Driving with a malfunctioning battery management system can be unsafe and may lead to further vehicle damage.
• Vehicle must be in a safe, stationary position.
• Battery should be at a stable temperature.
The battery cell balancing circuit is located within the vehicle's battery management system, typically near the battery pack.
Q: Can I drive my car with this code?
A: It's not recommended to drive the vehicle until the issue is fixed, as it can lead to further battery damage.
Q: How can I prevent this issue?
A: Regular maintenance and proper charging habits can help prevent this issue.
Budget · Enhanced code reader
A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
A dependable first-pass scanner for verifying the code and checking live data or readiness monitors.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for voltage, continuity, and basic electrical checks while narrowing down the fault.
View on Amazon
Universal · Socket set
A practical metric and SAE socket set for many diagnostic teardowns and component replacements.
Useful for common under-hood access and removal work during diagnosis or repair.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.