DTC P2756-7F: Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off [10/2022 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

The ECM controls the solenoid (SLU) valve using a predetermined current, and performs lock-up and flex lock-up control.

The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical malfunctions of the solenoid (SLU) valve, transmission valve body assembly and torque converter assembly.

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*1	Spool Valve	*2	Sleeve
*3	Solenoid Coil	-	-
*a	Current	*b	Hydraulic Pressure

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P2756-7F	Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off	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 being driven with the shift state drive (D). No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system. Any of the following conditions are met: When the ECM sends a lock-up OFF request, the difference between the input turbine speed (NT) and the engine speed (NE) is less than 35 rpm for 1.8 seconds or more. When the ECM sends a lock-up ON request, the difference between the input turbine speed (NT) and the engine speed (NE) is 170 rpm or more for 3.5 seconds or more.	Solenoid (SLU) valve Transmission valve body assembly Torque converter assembly Automatic transaxle assembly	Comes on	Transmission	B	SAE Code: P2757

DTC DETECTION CONDITION PATTERNS:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	Engine coolant temperature is 40°C (104°F) or higher.	◦	◦
	ATF temperature is -10°C (14°F) or higher.	◦	◦
	The vehicle is being driven with the shift state drive (D).	◦	◦
	No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system.	◦	◦
Malfunction Condition	When the ECM sends a lock-up OFF request, the difference between the input turbine speed (NT) and the engine speed (NE) is less than 35 rpm.	◦	-
Malfunction Condition	When the ECM sends a lock-up ON request, the difference between the input turbine speed (NT) and the engine speed (NE) is 170 rpm or more.	-	◦
Duration		1.8 seconds or more	3.5 seconds or more
Detection Logic		2-trip detection logic	2-trip detection logic

HINT:

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