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2020 TOYOTA COROLLA
1.8L I4 Hybrid•FWD•CVT•hybrid•2ZR-FXE
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor484Torque1474Fluid7DTC1933Battery1Maintenance0Recalls3
P3220moderate severityPowertrain

Electric Motor/Generator A Temperature Sensor Circuit

on 2020 Toyota Corolla 1.8L I4 Hybrid · FWD

What this code means

The temperature sensor for the primary motor/generator (MG1) is reporting values outside the expected range.

Symptoms

  • Hybrid/EV warning light
  • Motor power derated
  • Reduced acceleration
  • Limp mode
  • Motor protection mode active
  • Regenerative braking limited

Common causes

  • Faulty motor temperature sensor
  • Corroded sensor connector
  • Sensor wiring damage
  • Sensor shorted internally
  • ECU analog input failure

Diagnostic steps

  1. Read motor temperature PID
  2. Compare sensor reading to infrared measurement
  3. Test sensor resistance vs temperature spec
  4. Inspect connector and wiring
  5. Check for shorts in wiring harness

Repair notes

Replace motor temperature sensor. Requires partial disassembly of motor housing on some designs.

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