Lost Communication With Battery Cell Balancing Module
The U0267 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Battery Cell Balancing Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $400 - $2,500 (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
- Individual cell voltages drifting apart
- Reduced charging capacity
- Battery warning light on
- Premature charge cutoff
- Uneven temperature across battery pack
Probable Causes (Ranked by Likelihood)
- Failed cell balancing circuit board Very High
- Individual cell group degradation High
- CAN bus wiring fault Moderate
- Balancing resistor failure Low
Step-by-Step Diagnostic Procedure
-
Check individual cell voltages
-
Scan cell balancing module for codes
-
Test CAN bus at balancing module
-
Inspect balancing circuit connections
Frequently Asked Questions
Can I drive with U0267?
Short distances. Unbalanced cells can cause premature capacity loss.
What causes U0267?
Usually a failed balancing circuit board or individual cell degradation.
Is cell balancing automatic?
Yes. The BMS automatically balances cells during charging. U0267 means this process is disrupted.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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