Lost Communication With EV Energy Recovery Module
The U0227 code means the vehicle's onboard diagnostic system has detected: Lost Communication With EV Energy Recovery Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $400 - $1,500 (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
- Regenerative braking reduced or absent
- Coasting distance increased
- Lower energy efficiency displayed
- Energy recovery indicator not showing
Probable Causes (Ranked by Likelihood)
- Failed energy recovery module Very High
- CAN bus communication fault High
- Motor generator sensor failure Moderate
- Software calibration error Low
Step-by-Step Diagnostic Procedure
-
Scan energy recovery module for fault codes
-
Test CAN bus communication at module
-
Check motor generator sensors
-
Verify module software calibration
Frequently Asked Questions
Can I drive with U0227?
Short distances only. Conventional brakes work but energy recovery is lost.
What causes U0227?
Typically a failed module or CAN bus communication fault.
How does this affect range?
Regen braking recovers 10-30% of energy. Without it range decreases noticeably.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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