P1744: Torque Converter Clutch System Performance
4 vehicles · 2 makes · $25-$3,800 repair
Most Reported On
P1744 is an OBD-II diagnostic trouble code meaning “Torque Converter Clutch System Performance.” This transmission code means the torque converter clutch (TCC) system is not performing as expected — the lockup clutch inside the torque converter is slipping or not engaging and disengaging properly. The TCC mechanically links the engine to the transmission at cruising speeds to improve efficiency, and the computer monitors slip between engine and transmission speeds to verify it. Excess slip or improper engagement sets this code. You may feel shuddering, RPM that won't settle at cruise, or reduced fuel economy. This code is most commonly reported on 1996-2003 Ford Windstar, 1990-1997 Ford Aerostar, and 1991-1999 Ford Explorer (XL, XLT, Sport, Eddie Bauer, Limited), plus 1 other vehicle, with repair costs ranging from $25 to $3,800.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1744, 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 (4)
FAQ
What does P1744 mean?
P1744 stands for "Torque Converter Clutch System Performance." This transmission code means the torque converter clutch (TCC) system is not performing as expected — the lockup clutch inside the torque converter is slipping or not engaging and disengaging properly. The TCC mechanically links the engine to the transmission at cruising speeds to improve efficiency, and the computer monitors slip between engine and transmission speeds to verify it. Excess slip or improper engagement sets this code. You may feel shuddering, RPM that won't settle at cruise, or reduced fuel economy.
What are the most common causes of P1744?
The most common causes of P1744 are: Worn or failing torque converter / lockup clutch, Faulty TCC solenoid, Low or degraded/contaminated transmission fluid, Dirty valve body or stuck valve affecting TCC apply, Damaged TCC solenoid wiring or connector, Internal transmission wear causing excess slip, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P1744?
Repair costs for P1744 range from $25 to $3,800, depending on the vehicle and root cause.
Which vehicles are affected by P1744?
Au7o has documented P1744 across 4 vehicle models from 2 manufacturers: Ford, Mazda.
Sources (12)
- mediaFord AX4S Transmission Problem - AA1Car
- mediaFord Windstar Transmission Problems & Overview - TransmissionRepairCostGuide
- mediaFord Automatic 4 speed - Center for Auto Safety
- ForumAX4S Transmission Problem - Taurus Car Club
- mediaFord Ranger A4LD Automatic Transmission - The Ranger Station
- mediaFord A4LD Transmissions Specs - TransmissionRepairCostGuide
- ForumA4LD Shifting issues 2nd missing - Ford Explorer Forums
- Forumlist of common A4LD problems - Ford Explorer Forums
- articleSeven Common Problems With The Ford 4R55E Transmission - The Ranger Station
- ForumA4ld - no overdrive - Ford Explorer Forums
- ForumTransmission Failure Common: Mazda 626 Transmission & Drivetrain
- NHTSA1997 Mazda 626 Power Train: Automatic Transmission Problems (210 complaints)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.