Lost Communication With EV Traction Battery Module A
The U0220 code means the vehicle's onboard diagnostic system has detected: Lost Communication With EV Traction Battery Module A. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $1,500 - $8,000 (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
- High-voltage battery fault warning
- Vehicle will not start or move
- Significant range reduction
- Battery disconnect warning
- Multiple EV system warnings
Probable Causes (Ranked by Likelihood)
- Failed traction battery module A controller Very High
- High-voltage connection fault High
- Battery cell failure in module A Moderate
- CAN bus wiring damage Low
Step-by-Step Diagnostic Procedure
-
Check high-voltage battery connections
-
Scan traction battery module A for fault codes
-
Test CAN bus communication at battery module
-
Check individual cell voltages in module A
Frequently Asked Questions
Can I drive with U0220?
No. Loss of traction battery communication is a critical failure.
What causes U0220?
Usually a failed battery module controller or high-voltage connection fault.
Is U0220 expensive?
Yes, potentially $1,500 to $8,000 for battery module repairs.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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