Lost Communication With EV Preconditioning Module
The U0225 code means the vehicle's onboard diagnostic system has detected: Lost Communication With EV Preconditioning Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $200 - $800 (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
- Cabin preconditioning not activating
- Battery preconditioning not working
- Climate pre-start feature disabled
- App remote climate not responding
Probable Causes (Ranked by Likelihood)
- Failed preconditioning module Very High
- CAN bus communication fault High
- Software error in preconditioning system Moderate
- 12V battery too low for preconditioning Low
Step-by-Step Diagnostic Procedure
-
Check 12V battery voltage
-
Scan preconditioning module for fault codes
-
Reset and reprogram preconditioning settings
-
Verify CAN bus communication at module
Frequently Asked Questions
Can I drive with U0225?
Yes. Only preconditioning features are affected.
What causes U0225?
Typically a software error or failed module. A weak 12V battery can also prevent activation.
How do I fix U0225?
Check the 12V battery first, then try a software reset.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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