DTC P012F-62: Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure [06/2018 - 07/2019]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The engine is equipped with an engine coolant temperature sensor and an engine oil temperature sensor. The engine coolant temperature sensor and engine oil temperature sensor each have a built-in thermistor. As the temperature decreases, the thermistor resistance increases and as the temperature increases, the thermistor resistance decreases. The voltages at the respective terminals of the ECM change in accordance with the changes in the resistance of the thermistors. The ECM performs control based on these voltages.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P012F-62	Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure	All of the following conditions are met (2 trip detection logic): The auxiliary battery voltage is higher than 8 V. 5 hours or more have elapsed since the engine stopped on the previous trip. The engine oil temperature is -10°C (14°F) or higher. The engine coolant temperature is -10°C (14°F) or higher. The difference between the readings of the engine coolant temperature and engine oil temperature is higher than 20°C (36°F).	Engine coolant temperature sensor Engine oil temperature sensor ECM	Comes on	DTC stored	SAE Code: P012F