P3422moderate severityPowertrain
Charge Port Proximity Detection Circuit Fault
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The proximity detection circuit that detects when a charging connector is inserted is malfunctioning. This circuit uses a pilot signal to communicate with the EVSE.
Symptoms
- Vehicle does not detect charger connected
- Charge session will not initiate
- Intermittent charge recognition
- EVSE shows no vehicle detected
- Dashboard shows not connected despite plugged in
Common causes
- Proximity pilot circuit damaged
- Charge port connector pin damage
- EVSE pilot wire fault
- Charge port control module failure
- Water intrusion affecting pilot signal
Diagnostic steps
- Test pilot signal voltage levels at charge port
- Inspect charge port pins for damage or corrosion
- Test with different EVSE equipment
- Measure proximity resistor values
- Check charge port control module operation
Repair notes
Replace charge port assembly or repair pilot circuit. Inspect connector pins for damage.
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