P0740 on Toyota
Torque Converter Clutch Circuit Malfunction
P0740 on Toyota vehicles indicates torque converter clutch circuit malfunction. Au7o has documented this code across 7 Toyota models — most commonly on 4Runner, C-HR, Corolla. This code indicates a malfunction in the torque converter clutch (TCC) circuit of an automatic transmission. The torque converter clutch mechanically locks the engine to the transmission at cruising speed to improve fuel economy and reduce slippage, and it is engaged by a solenoid controlled by the transmission computer. The code sets when the computer detects an electrical problem with the clutch circuit or sees that the clutch is not engaging or holding as expected. Common signs include slipping, shuddering, poor fuel economy, or stalling when coming to a stop. Typical repair costs on Toyota range from $150 to $4,500, depending on the specific model and root cause.
Common Causes of P0740
- •Faulty torque converter clutch (TCC) solenoid
- •Low or contaminated transmission fluid
- •Wiring or connector fault in the TCC circuit
- •Worn or failing torque converter
- •Valve body wear or sticking valves
- •Internal transmission electrical short
- •Faulty transmission control module
P0740 on Toyota by Model
Toyota 4Runner(1 issue)
- Transmission Shudder / Torque Converter Issues2010-2015
Some 4Runners experience a shudder during light acceleration, typically between 35-50 mph. The issue is often related to the torque converter lockup clutch or transmission fluid condition. Toyota released TSBs addressing fluid type and software updates.
Toyota C-HR(1 issue)
- CVT Transmission Hesitation and Rubber Band Effect2018-2022
The C-HR's CVT (K120) exhibits noticeable hesitation on acceleration and the typical CVT 'rubber band' effect where engine RPM rises before the vehicle accelerates. The lag between throttle input and forward motion is more pronounced than in competing vehicles.
Toyota Corolla(1 issue)
- CVT Transmission Shudder and Failure2014-2019
The Continuously Variable Transmission (CVT) in 2014-2019 Corollas may experience shuddering, jerking during acceleration, high RPM before shifting, and in severe cases complete transmission failure. Issues are particularly reported when accelerating from a stop or during downshifting. Some owners have experienced catastrophic failures at relatively low mileage.
Toyota Highlander(1 issue)
- 8-Speed Automatic Transmission Shudder and Hesitation2020-2024
The Direct Shift 8AT transmission in 4th-gen Highlanders exhibits shudder, hesitation on acceleration, and rough downshifts. The torque converter lockup clutch causes vibration at low speeds, particularly between 25-45 mph.
Toyota RAV4(1 issue)
- Transmission Hesitation and Lurching at Low Speeds2019-2023
The vehicle hesitates and lurches when accelerating from a slow or rolling stop, particularly at traffic lights or in stop-and-go traffic. The magnetic clutch in the Direct Shift-CVT transmission causes delayed engagement. A class action investigation is ongoing for 2021-2023 models.
Toyota Tacoma(1 issue)
- 6-Speed Automatic Rough Shifting2016-2023
The 6-speed automatic transmission can exhibit rough or hesitant shifting, particularly between 1st and 2nd gear at low speeds. Some owners describe it as lurching or jerking. This is related to the transmission's adaptive learning and torque converter behavior.
Toyota Yaris(1 issue)
- 4-Speed Automatic Transmission Shudder and Harsh Shifts2007-2018
The U340E/U441E 4-speed automatic in the Yaris develops shudder during torque converter lockup and harsh shifts, particularly 1-2 and 2-3 shifts. Worn transmission fluid and torque converter clutch material are the primary causes.
Looking for P0740 on a different make?
View P0740 across all makes →Frequently Asked Questions
What does P0740 mean on Toyota?▼
P0740 stands for "Torque Converter Clutch Circuit Malfunction." This code indicates a malfunction in the torque converter clutch (TCC) circuit of an automatic transmission. The torque converter clutch mechanically locks the engine to the transmission at cruising speed to improve fuel economy and reduce slippage, and it is engaged by a solenoid controlled by the transmission computer. The code sets when the computer detects an electrical problem with the clutch circuit or sees that the clutch is not engaging or holding as expected. Common signs include slipping, shuddering, poor fuel economy, or stalling when coming to a stop. On Toyota specifically, this code is documented across 7 models.
What causes P0740 on Toyota vehicles?▼
Common causes on Toyota: Faulty torque converter clutch (TCC) solenoid, Low or contaminated transmission fluid, Wiring or connector fault in the TCC circuit, Worn or failing torque converter, Valve body wear or sticking valves. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0740 on a Toyota?▼
Repair costs on Toyota range from $150 to $4,500, depending on the specific model and root cause.
Which Toyota models have P0740 documented?▼
Au7o has documented P0740 on 7 Toyota models: 4Runner, C-HR, Corolla, Highlander, RAV4, Tacoma, Yaris.