P0740 on Toyota: How to Diagnose & Fix
Torque Converter Clutch Circuit Malfunction
8 Toyota models · 9 documented issues · 2 critical · $150-$8,000 repair
P0740 on Toyota by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Rough 1-2 shift at low speeds
- Lurching when accelerating gently
- Hesitation from stop
- Clunk when shifting
- Jerky driving in traffic
How to Fix
Ensure transmission software is updated. Transmission may need adaptive learning reset. Regular transmission fluid changes help. Toyota has issued TSBs with software updates for some model years.
Owner tips & cautions
- TipRegular transmission fluid changes help.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota Tacoma forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
Sources for this issue (1)
Early-production 4th-generation Tacomas with the 8-speed automatic transmission can suffer internal failure of the torque converter clutch actuator or pressure-control solenoids, often at very low mileage (some under 15,000 miles). Owners report harsh 1st-to-3rd-gear jerking, slipping, lunging, the truck dropping into neutral or getting stuck in gear, and sudden loss of drive. Toyota traced the cause to a stuck pressure-control solenoid actuator or torque-converter-clutch actuator (with manufacturing debris suspected) and issued TSB T-SB-0076-24, superseded by T-SB-0094-24 which added the Hybrid (i-FORCE MAX). The fix is not a calibration but a complete transmission and torque-converter replacement.
Common Symptoms
- Harsh or jerky 1st-to-3rd gear shifting
- Transmission slipping or lunging
- Truck drops into neutral or gets stuck in gear
- Loss of power / sluggish acceleration
- Check engine light with transmission DTCs
- Failure often within first 10,000-15,000 miles
How to Fix
Have the dealer scan for the listed DTCs and perform the transmission and torque-converter replacement under TSB T-SB-0076-24 / T-SB-0094-24. Repairs are covered under Toyota's 60-month/60,000-mile powertrain warranty at no cost. If the dealer claims they cannot replicate the symptom, document occurrences (dates, mileage, video) and request the field-fix bulletin be applied; escalate to Toyota corporate (1-800-331-4331) if denied.
Sources for this issue (3)
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.
Common Symptoms
- Shudder at 25-45 mph under light throttle
- Hesitation on acceleration from stop
- Rough downshifts when slowing
- Vibration felt through seat and steering wheel
How to Fix
Visit dealer for TCM software update (TSB 0011-21). Transmission fluid drain and refill with Toyota WS ATF may help. Some owners report improvement after the transmission 'learns' driving habits over 5,000+ miles. Persistent cases may need torque converter replacement.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 00289-ATFWS genuine World Standard automatic transmission fluid, 1 quart
correct fluid only when level correction or a repair-manual drain-and-refill is indicated after diagnosis Fitment/availability: VIN-confirmed 2020-2024 Highlander automatic transaxle that specifies Toyota WS; quantity follows the measure…
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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.
Common Symptoms
- Shudder at 25-40 mph during light throttle
- Harsh 1-2 and 2-3 gear shifts
- Transmission slipping sensation
- Delayed engagement from Park to Drive
How to Fix
Perform triple drain-and-fill with Toyota WS ATF (or Toyota Type T-IV for older models). If shudder persists, torque converter replacement. Regular ATF changes every 30,000 miles prevent the issue. The 4-speed automatic is otherwise quite reliable when maintained.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 00289-ATFWS genuine World Standard automatic-transmission fluid, 1 quart
measured refill only after diagnosis shows fluid service is justified; never mix with Toyota Type T-IV Fitment/availability: 2007-2018 U.S.-market Yaris 4-speed automatic branches whose VIN-specific owner's or service manual calls for To…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
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.
Common Symptoms
- Jerking or shuddering when accelerating from a stop
- High RPM before the transmission engages
- Hesitation or slipping during acceleration
- Transmission not shifting into gear
- Complete loss of power while driving
How to Fix
Perform CVT fluid change at recommended intervals (every 60,000 miles). Software update from Toyota dealer for transmission control module. Replace torque converter if diagnosed as failed. Complete CVT transmission replacement in severe cases.
Owner tips & cautions
- WarningThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota Corolla forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
Sources for this issue (4)
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.
Common Symptoms
- Delay between pressing gas and vehicle accelerating
- Engine RPM rises before speed increases
- Hesitation when merging or passing
- Jerky low-speed acceleration
How to Fix
Toyota released ECU/TCU software updates that improve throttle response mapping. Visit dealer for the latest calibration. CVT fluid change with Toyota CVT Fluid TC at 60,000 miles improves responsiveness. Some owners install aftermarket throttle controllers (Sprint Booster or Pedal Commander) to reduce the electronic throttle delay.
P0740 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0740 mean on a 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 it is documented across 8 models: Tacoma, Highlander, Yaris, Corolla, C-HR, 4Runner, RAV4, Tundra.
What are the most common causes of P0740?
The most common causes of P0740 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0740 on a Toyota?
Published repair estimates on Toyota range from $150 to $8,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0740 on a different make?
View P0740 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.