DTC P0AA0-73: Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. 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	DTC Output from	Priority	Note
P0AA0-73	Hybrid/EV Battery Positive and Negative Contactor Actuator Stuck Closed	Even if 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)	No. 1 traction battery device box assembly Hybrid motor control inverter assembly Hybrid vehicle control ECU Wire harness or connector	Does not come on	Master Warning: Comes on	Hybrid Control	A	SAE Code: P0AA1