P0740: Torque Converter Clutch Circuit Malfunction
66 vehicles · 19 makes
P0740 is an OBD-II diagnostic trouble code meaning “Torque Converter Clutch Circuit Malfunction.” The torque converter clutch solenoid circuit has a fault. Can cause poor fuel economy and transmission shudder. This code appears across 66 vehicle models from 19 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0740, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (66)
8/10-Speed Transmission Shudder
8-Speed Transmission Shudder/Harsh Shifts
8-Speed Automatic Transmission Shudder (8L90/8L45)
Transmission Shudder and Torque Converter Failure
8L90 8-Speed Transmission Shudder
8L90 Transmission Shudder
Driveline Vibration at Low Speed - C7
10-Speed Transmission Shudder/Harsh Shifts
4R70W/4R75W Transmission Shift Solenoid Pack Failure
10-Speed Automatic Transmission Shudder
Torque Converter Shudder and Transmission Failure
CVT Transmission Shudder/Judder
Torque Converter Shudder (6-Speed Auto)
ZF 9-Speed Transmission Rough Shifting, Shudder, and Hesitation (2.0T)
Vibration at Idle (In Gear)
CVT Start Clutch Juddering
Automatic Transmission Failure and Harsh Shifting
CVT Transmission Problems (3rd Gen)
Highway Vibration and Wobble (45-65 MPH)
CVT Transmission Shuddering and Judder
Automatic Transmission Torque Converter Clutch Shudder and 2nd-Gear Failure
CVT Transmission Judder and Failure (Second Gen)
Automatic Transmission 2nd-Gear Overheating and Torque Converter Failure
Transmission Shudder and Hard Shifting
CVT Transmission Failure/Shudder
CVT Transmission Failure
CVT Transmission Failure/Shudder
CVT Transmission Failure (Jatco CVT7/JF015E)
CVT Transmission Failure (Jatco CVT7/JF015E)
CVT Transmission Failure (Jatco CVT8/JF016E)
CVT Transmission Failure and Shudder
CVT Transmission Shudder and Failure (Jatco CVT8)
CVT Transmission Failure (Jatco CVT7)
CVT Transmission Failure Under Load
CVT Overheating During Highway Driving
Excessive Engine Noise and Vibration (HR16DE)
CVT Transmission Shudder and Premature Failure
CVT Transmission Shudder/Hesitation
CVT Transmission Hesitation and Harsh Engagement
CVT Chain Stretch and Transmission Judder
CVT Transmission Failure
CVT Transmission Failure and Harsh Engagement
CVT Valve Body Failure and Transmission Warning
Transmission Hesitation and Lurching at Low Speeds
6-Speed Automatic Rough Shifting
8-Speed Automatic Transmission Shudder and Hesitation
4-Speed Automatic Transmission Shudder and Harsh Shifts
CVT Transmission Shudder and Failure
CVT Transmission Hesitation and Rubber Band Effect
Transmission Shudder / Torque Converter Issues
Aisin TF-80SC 6-Speed Transmission Shudder and Valve Body Failure
8-Speed Automatic Delayed Engagement and Hesitation
AW50-42 Automatic Transmission Shudder
AW50-42 Automatic Transmission Failure
FAQ
What does P0740 mean?
P0740 stands for "Torque Converter Clutch Circuit Malfunction." The torque converter clutch solenoid circuit has a fault. Can cause poor fuel economy and transmission shudder.
What are the most common causes of P0740?
The most common causes of P0740 are: Failed TCC solenoid, Wiring issue, Low transmission fluid, Contaminated fluid, Internal transmission issue. The specific cause varies by vehicle.
How much does it cost to fix P0740?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0740?
Au7o has documented P0740 across 66 vehicle models from 19 manufacturers: Acura, Audi, BMW, Cadillac, Chevrolet, Dodge, Ford, GMC, Honda, Hyundai, Jeep, Kia, Mazda, Nissan, RAM, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.