P0740 on Kia: How to Diagnose & Fix
Torque Converter Clutch Circuit Malfunction
3 Kia models · 3 documented issues · $150-$5,500 repair
P0740 on Kia by model: symptoms, diagnosis and fix
The IVT (Intelligent Variable Transmission, Kia's name for its CVT) in the 2019-2024 Forte develops a shuddering sensation during light-to-moderate acceleration, particularly from stops and at speeds between 20-45 mph. Separately, Kia's voluntary emissions service campaign SC199 covers 2019-2020 Fortes built July 9, 2018 to April 2, 2020 whose IVT may set a check-engine light (P0730, P0731, P0741 or P0867) with a lack of or delay in acceleration due to transmission slippage. Kia has released multiple software updates to improve shift mapping and reduce the shudder sensation.
Common Symptoms
- Shuddering during acceleration from stops
- Hesitation or rubber-band feel during acceleration
- Vibration felt through accelerator pedal at 20-45 mph
- Whining noise from transmission during acceleration
- RPMs fluctuate unexpectedly during steady cruise
How to Fix
Have dealer perform TCU software update (latest calibration; on 2019-2020 cars built through April 2, 2020 this is campaign SC199, which also authorizes IVT replacement if the relearn fails). If shudder persists after software update, CVT fluid change with genuine Kia CVTF may help. In severe cases, CVT valve body or complete CVT replacement under powertrain warranty (10 years/100,000 miles). Kia specifies SP-CVT1 fluid (part UM018 CH130) for the IVT.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Owner tips & cautions
- TipStart with the free TCU software update at the dealer - this resolves or significantly improves the shudder in about 60% of cases
Sources for this issue (1)
The 2015-2021 Sedona's automatic transmission (6-speed through 2018, 8-speed from 2019) develops shuddering during gear changes, harsh shifts, and delayed engagement. The torque converter lock-up clutch wears prematurely, and the transmission valve body develops stuck solenoids. Kia released multiple TCU software updates to improve shift quality. In severe cases, torque converter or complete transmission replacement is needed.
Common Symptoms
- Shuddering during 2-3 and 3-4 gear changes
- Harsh or jerky downshifts
- Delayed engagement when shifting from Park to Drive
- Transmission slipping under load (uphill, towing)
- Check engine light with transmission codes
How to Fix
Start with TCU software update at dealer (often free under goodwill). If shudder persists, transmission fluid flush with Kia SP-IV ATF may help. Torque converter replacement ($1,200-2,500) for shudder. Valve body replacement ($800-1,500) for shift quality issues. Complete transmission replacement ($3,500-5,500) for severe cases.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Kia ATF SP-IVOEMKia UM013-CH059
Use for a Kia-specified fluid exchange or level correction only when service history and diagnosis call for it Fitment/availability: 2015-2021 Kia Sedona automatic-transmission branches covered by Kia's fluid guide; fluid specification U…
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
- TipChange transmission fluid every 30,000 miles with Kia SP-IV ATF. Many Sedona transmission failures are linked to neglected fluid changes
Sources for this issue (2)
The Seltos equipped with the 2.0L engine and CVT (IVT) exhibits hesitation, jerking, and poor acceleration response, particularly when merging or climbing hills. The CVT struggles under load and can enter limp mode. Owners report the transmission feels sluggish compared to traditional automatics. Kia has released TCU software updates to improve response.
Common Symptoms
- Hesitation during acceleration from stops
- Jerking or surging at low speeds
- Poor acceleration when merging onto highway
- Transmission enters limp mode under heavy load
- Rubber-band effect during passing maneuvers
How to Fix
Have dealer perform TCU software update (Kia voluntary emissions service campaign SC199, formerly SA424/ELE200, updates the TCM logic and replaces the IVT if necessary at no cost on 2021 Seltos built 11/20/2019-4/10/2020). If CVT fluid has not been changed, a fluid service with genuine Kia CVTF may improve response. For persistent issues, CVT replacement under powertrain warranty (10 years/100,000 miles). Some owners find that using Sport mode improves daily driving feel.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Kia SP-CVT1 IVT fluidOEMKia UM018-CH130
Kia marks this application no flush; follow the exact temperature and level procedure and do not treat fluid as a repair for internal
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
- TipUse Sport mode in heavy traffic and for highway merging. The default Eco/Normal calibration is tuned for fuel economy and feels sluggish
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 Kia?
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 Kia it is documented across 3 models: Forte, Sedona, Seltos.
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 Kia?
Published repair estimates on Kia range from $150 to $5,500 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.