DTC P0C73-96: Motor Electronics Coolant Pump "A" Component Internal Failure [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.

The inverter water pump assembly transmits rotation speed information to the hybrid vehicle control ECU. The hybrid vehicle control ECU monitors the speed and detects malfunctions.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0C73-96	Motor Electronics Coolant Pump "A" Component Internal Failure	The inverter water pump assembly revolution speed is abnormally high or low (or stopped) for 1 minute or more. (1 trip detection logic)	Inverter cooling system Wire harness or connector Inverter water pump assembly Hybrid vehicle control ECU	Comes on	Master Warning Light: Comes on

HINT:

The inverter water pump assembly operates when the power switch is on (READY).

RELATED DATA LIST

DTC No.	Data List
P0C73-96	Inverter Water Pump Revolution Inverter Water Pump Duty Ratio Inverter Coolant Water Temperature

RELATED ACTIVE TEST

DTC No.	Active Test
P0C73-96	Activate the Inverter Water Pump