P0742 on Kia: How to Diagnose & Fix
Torque Converter Clutch Circuit Stuck On
1 Kia model · 1 documented issue · $150-$5,500 repair
P0742 on Kia by model: symptoms, diagnosis and fix
The 2015-2021 Sedona with the 6-speed automatic transmission 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…
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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
P0742 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 P0742 mean on a Kia?
P0742 stands for "Torque Converter Clutch Circuit Stuck On." P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine. On Kia it is documented across 1 model: Sedona.
What are the most common causes of P0742?
The most common causes of P0742 are: Stuck or failed torque converter clutch solenoid, Stuck valve in the valve body (TCC apply valve), Contaminated or degraded transmission fluid, Internal transmission hydraulic leak holding the clutch on, Wiring or connector fault to the TCC solenoid, Faulty torque converter, Dirty or clogged transmission filter. The specific cause varies by vehicle.
How much does it cost to fix P0742 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.
Looking for P0742 on a different make?
View P0742 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.