DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 108 (Hybrid Control System (2WD) - Diagnostic Codes (3 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P0AA0-73: Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed [12/2019 - 11/2023] >> DTC Summary

DTC Summary

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

    The hybrid vehicle control ECU detects a stuck closed malfunction of a system main relay on the positive (+) terminal side and negative (-) terminal side of the HV battery.

    The cause of this malfunction may be one of the following:

    Inverter voltage sensor (VH) internal circuit malfunction 

    • Voltage sensor (VH) malfunction
    • Motor generator control ECU (MG ECU) malfunction
    • Communication (wire harness) malfunction

    High voltage system malfunction 

    1. HV battery junction block assembly malfunction

    Low-voltage circuit (12 V) malfunction 

    • Hybrid vehicle control ECU malfunction
    • HV battery junction block assembly malfunction
    • Low voltage wire harness malfunction
    • Low voltage connector malfunction