P3423high severityPowertrain
DC Fast Charge Communication Protocol Error
on 2012 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The vehicle cannot establish proper communication with the DC fast charging station. The CHAdeMO, CCS, or Tesla protocol handshake has failed.
Symptoms
- DC fast charging unavailable
- Charge session fails to start
- Error message about charging station
- AC charging works but DC does not
- Timeout during charge negotiation
Common causes
- Charge port communication module fault
- DC charge inlet pins damaged
- Incompatible charging station firmware
- Vehicle charge controller software bug
- CAN or PLC communication circuit fault
Diagnostic steps
- Attempt DC charge at different stations
- Inspect DC charge inlet pins
- Check for vehicle software updates
- Read DC charge communication logs
- Test communication module with diagnostic tool
Repair notes
Update vehicle software if available. Replace DC charge communication module or charge port assembly if hardware fault confirmed.
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