P0742 on Hyundai: How to Diagnose & Fix
Torque Converter Clutch Circuit Stuck On
1 Hyundai model · 1 documented issue
P0742 on Hyundai by model: symptoms, diagnosis and fix
The 8-speed automatic transmission in the Palisade can exhibit harsh 1-2 and 2-3 upshifts, delayed downshifts when passing, and occasional harsh engagement from park to drive. The TCM calibration is the primary issue, though some cases involve valve body wear. Hyundai has released multiple software updates to improve shift quality.
Common Symptoms
- Harsh jolt on 1-2 upshift
- Delay when pressing gas to pass
- Clunk shifting from park to drive
- Hunting between gears on hills
- Transmission hesitation at low speed
How to Fix
Request the latest TCM software update from the dealer (free under warranty). Ensure transmission fluid is at the correct level and condition. If harsh shifting persists after software update, the valve body may need replacement ($800-1,500). Full transmission fluid change (not flush) every 30,000 miles with Hyundai SP-IV-RR fluid.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Hyundai ATF SP-IV automatic-transmission fluid — one quartOEMHyundai 00232-19057
Confirm the exact model-year manual and transmission service procedure before purchase.
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Owner tips & cautions
- TipAfter a TCM update, the transmission needs 500-1,000 miles of driving to fully relearn your driving patterns
Sources for this issue (2)
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 Hyundai?
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 Hyundai it is documented across 1 model: Palisade.
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 Hyundai?
Repair costs vary widely with the root cause and Hyundai model; each issue on this page carries its own estimate where one is published.
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.