DTC P0AA0-73: Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed [08/2020 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

Refer to the description for DTC P0AE4-11.

Refer to DESCRIPTION

This circuit uses the hybrid vehicle control ECU to monitor the system main relays and stops the system if a malfunction is detected in the relays, because it may be impossible to shut off the high-voltage system if any of the relays becomes stuck.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0AA0-73	Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed	Even both of the system main relays (HV battery positive (+) and negative (-) terminal side) are turned off, the inverter voltage (VH) does not drop. (1 trip detection logic)	HV battery junction block assembly Inverter with converter assembly Hybrid vehicle control ECU Wire harness or connector	Does not come on	Master Warning Light: Comes on

RELATED DATA LIST

DTC No.	Data List
P0AA0-73	Hybrid/EV Battery Voltage VH-Voltage after Boosting VL-Voltage before Boosting