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P3420

Charge Port Inlet Temperature Sensor Fault

2012-2017 Buick Regal 2.4L I4 Hybrid

Moderate SeverityPowertrainGeneric (SAE)

Description

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

  1. Read charge port temperature PID during charging
  2. Test sensor resistance vs temperature specification
  3. Inspect charge port for water or debris
  4. Check sensor wiring continuity
  5. Compare with infrared temperature measurement

Repair Notes

Replace charge port temperature sensor. Clean charge port inlet. Ensure port seal is intact.

Related Codes

P3400Onboard Charger (OBC) Internal FaultP3421Charge Port Locking Actuator MalfunctionP3422Charge Port Proximity Detection Circuit Fault

Other Powertrain Codes

P3420 on Other Vehicles

Common Questions

What does code P3420 mean on a 2012-2017 Buick Regal?

P3420 stands for "Charge Port Inlet Temperature Sensor Fault". The temperature sensor at the charge port inlet is malfunctioning. This sensor is critical for monitoring connector temperature during charging to prevent overheating.

What are the symptoms of P3420 on a Buick Regal?

Common symptoms of P3420 include: Charging current limited, Charge port temperature warning, Charging may be disabled, Error on dashboard during charging, Reduced charging speed.

What causes P3420 on a 2012-2017 Buick Regal?

Common causes of P3420 include: Faulty inlet temperature sensor, Corroded sensor connector, Sensor wiring damage, Water intrusion in charge port, Sensor shorted by debris.

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