DTC P00B1-15: Radiator Coolant Temperature Sensor Circuit Short to Battery or Open [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 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 DTC P00B1-11.

Refer to DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P00B1-15	Radiator Coolant Temperature Sensor Circuit Short to Battery or Open	The No. 2 engine coolant temperature sensor output voltage is higher than 4.91 V for 3 seconds or more (1 trip detection logic).	Open or short in No. 2 engine coolant temperature sensor circuit No. 2 engine coolant temperature sensor ECM	Comes on	Engine	A	SAE Code: P00B4 DTC for Mexico Models: Does not apply

HINT:

When this DTC is output, check the No. 2 engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Radiator Coolant Temperature.

DTC No.	Radiator Coolant Temperature	Malfunction
P00B1-15	-40°C (-40°F)	Short to +B in THTW circuit Open in THTW circuit Open in ETHT circuit

If the Data List values are normal, it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]