AutoCodes – Lexus – P0741 Lexus

P0741 Lexus Code - Torque Converter Clutch Solenoid Performance

Quick Answer

Torque converter lock-up is controlled by the Engine Control Module (ECM) based on speed sensor NT, speed sensor NC, engine speed, engine load, engine temperature, vehicle speed, ATF temperature, and gear selection. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch Solenoid Valve (Shift Solenoid Valve SL). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0741 Lexus indicates Torque Converter Clutch Solenoid Performance.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch Solenoid Valve (Shift Solenoid Valve SL).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 16,335

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 11, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0741 Lexus Description

Torque converter lock-up is controlled by the Engine Control Module (ECM) based on speed sensor NT, speed sensor NC, engine speed, engine load, engine temperature, vehicle speed, ATF temperature, and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing the input turbine speed (NT) to the counter gear speed (NC). When conditions are appropriate, the ECM requests lock-up by applying a control voltage to shift solenoid valve SL. When the shift solenoid valve SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter.
If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in shift solenoid valve SL or lock-up system performance. The ECM will turn on the MIL and store the Diagnostic Trouble Code (DTC).

OBDII Code P0741 Lexus - Torque Converter Clutch Solenoid Performance - AutoCodes.com — P0741 Lexus Code - Torque Converter Clutch Solenoid Performance

What does this mean?

What are the Possible Causes of the DTC P0741 Lexus?

Low transmission fluid level
Dirty transmission fluid
Faulty Torque Converter Clutch Solenoid Valve (Shift Solenoid Valve SL)
Torque Converter Clutch Solenoid Valve harness or connectors
Torque Converter Clutch Solenoid Valve circuit is open or shorted
Transmission valve body assembly is blocked
Torque converter assembly
Transmission internal mechanical problem

How to Fix the DTC P0741 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0741 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.