Lost Communication With EV Battery Equalization Module
The U0230 code means the vehicle's onboard diagnostic system has detected: Lost Communication With EV Battery Equalization Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $400 - $2,000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Battery cell imbalance warning
- Reduced usable battery capacity
- Slower charging speeds
- Uneven battery degradation detected
Probable Causes (Ranked by Likelihood)
- Failed battery equalization module Very High
- Battery cell group degradation High
- CAN bus wiring fault to equalization module Moderate
- Software error in balancing algorithm Low
Step-by-Step Diagnostic Procedure
-
Scan battery equalization module for fault codes
-
Check individual cell group voltages
-
Test CAN bus communication at equalization module
-
Verify equalization module software version
Frequently Asked Questions
Can I drive with U0230?
Short distances only. Unbalanced cells reduce range and can damage the battery.
What causes U0230?
Typically a failed equalization module or degraded battery cells.
Why is cell equalization important?
Balanced cells ensure maximum capacity and battery lifespan.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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