DTC P0870-11: Transmission Fluid Pressure Sensor/Switch Circuit Short to Ground [11/2019 - ]: Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2024 Lexus RC 350, 2023 Lexus RC 350, 2022 Lexus RC 350, 2021 Lexus RC 350, and 2020 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.

The oil pressure switch, which is built into the transmission valve body assembly, detects the fluid pressure of the SL1 fluid pressure circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P0870-11	Transmission Fluid Pressure Sensor/Switch Circuit Short to Ground	All of the following conditions are met (2-trip detection logic): Engine coolant temperature is 40°C (104°F) or higher. ATF temperature is -10°C (14°F) or higher. The vehicle is driven with the shift lever in D. No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system. The following condition is met 2 times: When the actual gear is 1st, 2nd, 3rd, 4th or 5th gear, the oil pressure switch is OFF.	Oil pressure switch Transmission wire Harness and connector ECM	Comes on	DTC stored	SAE Code: P0872

DTC DETECTION CONDITION PATTERNS:

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5
Diagnostic Condition	Engine coolant temperature is 40°C (104°F) or higher.	◦	◦	◦	◦	◦
	ATF temperature is -10°C (14°F) or more	◦	◦	◦	◦	◦
	The vehicle is driven with the shift lever in D	◦	◦	◦	◦	◦
	No malfunctions are detected in the shift solenoid valve SL1, SL2, SL3, SL4, SL5 and SR, transmission revolution sensors (NT, NC3 and SP2), engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle and CAN communication system.	◦	◦	◦	◦	◦
Malfunction Condition	When the actual gear is 1st gear, the oil pressure switch is OFF.	◦	-	-	-	-
	When the actual gear is 2nd gear, the oil pressure switch is OFF.	-	◦	-	-	-
	When the actual gear is 3rd gear, the oil pressure switch is OFF.	-	-	◦	-	-
	When the actual gear is 4th gear, the oil pressure switch is OFF.	-	-	-	◦	-
	When the actual gear is 5th gear, the oil pressure switch is OFF.	-	-	-	-	◦
Duration		2 times	2 times	2 times	2 times	2 times
Detection Logic		2-trip detection logic	2-trip detection logic	2-trip detection logic	2-trip detection logic	2-trip detection logic

HINT:

This DTC is stored when any of the above detection patterns are met.