This is general guidance based on the ChargeX MREC standard. Actual charger behavior varies by manufacturer and firmware version. Always follow on-screen instructions and contact the charging network if you are unsure.
Warning
The charger's safety diode check failed during the initial handshake. This is a standard safety check for AC charging (IEC 61851). The charger detected that the vehicle's charging circuit does not have the required rectifier diode, or the diode is faulty.
What to do
- Unplug and retry once
- Try a different AC charger
- If this happens consistently with your vehicle, the onboard charger may need service
- DC fast charging may still work because it bypasses the onboard charger
Who's responsible?
- This may be a vehicle issue
Technical details
- Error code
- DiodeCheckFailed
- Category
- Vehicle
- Classification
- safety
- Source
- ChargeX MREC Standard (2023)
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