P3420moderate severityPowertrain
Charge Port Inlet Temperature Sensor Fault
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The temperature sensor at the charge port inlet is malfunctioning. This sensor is critical for monitoring connector temperature during charging to prevent overheating.
Symptoms
- Charging current limited
- Charge port temperature warning
- Charging may be disabled
- Error on dashboard during charging
- Reduced charging speed
Common causes
- Faulty inlet temperature sensor
- Corroded sensor connector
- Sensor wiring damage
- Water intrusion in charge port
- Sensor shorted by debris
Diagnostic steps
- Read charge port temperature PID during charging
- Test sensor resistance vs temperature specification
- Inspect charge port for water or debris
- Check sensor wiring continuity
- Compare with infrared temperature measurement
Repair notes
Replace charge port temperature sensor. Clean charge port inlet. Ensure port seal is intact.
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