DC Fast Charge Communication Protocol Error
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3423 on Other Vehicles
Common Questions
What does code P3423 mean on a 2012-2017 Buick Regal?
P3423 stands for "DC Fast Charge Communication Protocol Error". The vehicle cannot establish proper communication with the DC fast charging station. The CHAdeMO, CCS, or Tesla protocol handshake has failed.
What are the symptoms of P3423 on a Buick Regal?
Common symptoms of P3423 include: 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.
What causes P3423 on a 2012-2017 Buick Regal?
Common causes of P3423 include: 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.