P0740 on Toyota: How to Diagnose & Fix
Torque Converter Clutch Circuit Malfunction
6 Toyota models · 6 documented issues · 2 critical · $150-$8,000 repair
P0740 on Toyota by model: symptoms, diagnosis and fix
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 (K114) 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.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
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.
Common Symptoms
- Shudder at 35-50 mph
- Vibration during light throttle
- Feels like driving over rumble strips
- Shudder goes away with more throttle
How to Fix
Change transmission fluid using Toyota WS fluid only. Perform a drain-and-fill (not flush) 2-3 times over 10,000 miles to fully exchange fluid. If shudder persists, torque converter replacement may be needed ($1,200-2,000).
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota Genuine ATF WS one-quart bottle
correct-spec drain/refill consumable after diagnosis, not a guaranteed converter repair Fitment/availability: Toyota World Standard ATF; use only after confirming the exact 4Runner transmission specification and required service quantity…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipDIY repairs can save significantly - dealer charges $1,200-2,000 but DIY costs are typically 50-70% less
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota 4Runner 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)
Second-generation Tundras with the AB60E/AB60F 6-speed automatic commonly develop a torque-converter clutch (TCC) shudder felt as a vibration or 'rumble strip' sensation during light-to-moderate acceleration, typically between roughly 20-45 mph as the converter clutch tries to lock up. Toyota acknowledged the condition in TSB TC018-07 for 2007-2008 trucks. In that TSB, Toyota addressed the original torque converter design and released a redesigned converter. A worn torque-converter clutch and wear in the valve body TCC control valves also contribute, often aggravated by using fluid other than Toyota WS or by long fluid-change intervals. Left unaddressed, the slipping clutch contaminates the fluid and can damage the rest of the transmission. Common stored codes are P0741 (TCC stuck off) and P2757 (TCC pressure control).
Common Symptoms
- Vibration or shudder felt around 20-45 mph under light acceleration
- Feels like driving over rumble strips during lockup
- Flared, delayed, or harsh shifts
- Check engine light
- Worse when warm or towing
How to Fix
Confirm with a road test and scan for P0741/P0740/P2757. First step is a full Toyota WS fluid exchange (use ONLY WS-spec fluid). If shudder persists, the durable fix is replacing/rebuilding the valve body (or installing an upgraded valve body) and, per Toyota's original TSB, replacing the torque converter with the updated design. Many shops perform a valve-body modification (e.g., Sonnax/aftermarket) to restore TCC apply pressure and prevent recurrence. Address early to avoid converter and clutch-pack damage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 32000-0C060 genuine torque-converter assembly
replace the torque converter when Toyota's flex-lockup diagnostic branch confirms the affected converter condition Fitment/availability: Toyota catalog lists multiple 2007-2021 Tundra powertrains, so the buyer must confirm VIN, AB60E/AB6…
- Toyota 00289-ATFWS genuine World Standard automatic-transmission fluid
refill and level the transmission after a justified service or converter replacement, not as a promised cure for mechanical shudder Fitment/availability: Toyota WS specification fluid, part 00289-ATFWS; confirm the repair-manual fill qua…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
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.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (3)
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 an electrical malfunction in the torque converter clutch (TCC) solenoid 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 open, short, or out-of-range condition in the TCC solenoid circuit. A clutch that is commanded on but slips or won't hold sets a separate code (P0741). Common signs include the converter not locking up (higher cruise RPM and poor fuel economy), a check engine light, or stalling when coming to a stop if the clutch stays applied. On Toyota it is documented across 6 models: Yaris, Corolla, C-HR, 4Runner, Tundra, Tacoma.
What are the most common causes of P0740?
The most common causes of P0740 are: Faulty torque converter clutch (TCC) solenoid, Wiring or connector fault in the TCC circuit (open or short), Transmission case connector or internal harness damage, including fluid intrusion, 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 →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.