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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 78 (Motor Generator Control System (AWD) - Diagnostic Codes (1 Of 5)) >> MOTOR GENERATOR CONTROL SYSTEM (for AWD) >> DTC P0A00-1C: Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range [12/2019 - 11/2023] >> Description

DTC P0A00-1C: Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range [12/2019 - 11/2023]: Description

WARNING: This page is about a different variant/trim than selected.

The motor generator control ECU detects the HV coolant temperature using the HV coolant temperature sensor built into the inverter with converter assembly. The motor generator control ECU uses signals from the coolant temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the motor generator control ECU will limit inverter output to help prevent inverter overheating. The motor generator control ECU also detects malfunctions in the sensor based on the HV coolant temperature sensor values.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A00-1C Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range The actual inverter coolant temperature is high and the difference between the estimated inverter coolant temperature and the actual temperature exceeds a threshold for 10 seconds, or after a long soak, the inverter coolant temperature sensor value differs from the values of other sensors.
(1 trip detection logic)
  • Inverter cooling system
  • Cooling fan system
  • Grille shutter system
  • Inverter with converter assembly
  • Wire harness or connector
Comes on Master Warning:
Comes on
RELATED DATA LIST

DTC No. Data List
P0A00-1C
  • Inverter Coolant Temperature
  • Ambient Temperature
  • Inverter Water Pump Duty
  • Inverter Water Pump Revolution
  • Motor Temperature
  • Generator Temperature