Lost Communication With EV Auxiliary Power Module
The U0223 code means the vehicle's onboard diagnostic system has detected: Lost Communication With EV Auxiliary Power Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,200 (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
- 12V accessories losing power intermittently
- Infotainment system rebooting
- Climate control shutting off
- Headlights dimming
- Auxiliary battery warning
Probable Causes (Ranked by Likelihood)
- Failed auxiliary power module Very High
- 12V auxiliary battery degradation High
- CAN bus wiring fault Moderate
- Power module overheating Low
Step-by-Step Diagnostic Procedure
-
Test 12V auxiliary battery voltage and health
-
Check auxiliary power module connections
-
Scan auxiliary module for fault codes
-
Inspect CAN bus wiring to auxiliary module
Frequently Asked Questions
Can I drive with U0223?
Only short distances. Accessories may lose power and the vehicle may not restart.
What causes U0223?
Most commonly a degraded 12V auxiliary battery or failed auxiliary power module.
How much does U0223 cost to fix?
Typically $300 to $1,200.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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