P0744: Torque Converter Clutch Circuit Intermittent
Can you still drive? Yes, though the shuddering or surging at highway speeds is annoying and indicates a problem that will worsen. Schedule a repair within a few weeks.
What Does P0744 Mean?
Code P0744 means the TCC circuit is operating intermittently, engaging and disengaging erratically rather than staying locked when commanded. This creates a noticeable shudder or surging sensation at highway speed as the converter locks and unlocks repeatedly. The intermittent nature often points to a wiring issue, loose connector, or a TCC solenoid that is beginning to fail.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Intermittent TCC solenoid failure
- Loose or corroded wiring connection
- Worn TCC solenoid valve sticking intermittently
- Degraded transmission fluid
- Intermittent TCM ground connection
Symptoms
- Check engine light on
- Shudder or surge at highway speed
- RPM fluctuates at steady cruise
- Intermittent fuel economy changes
- Transmission feels like it is hunting between gears
Diagnostic Steps
- 1Monitor TCC solenoid duty cycle with scan tool during highway driving
- 2Wiggle-test the transmission connector while monitoring TCC operation
- 3Inspect all wiring to TCC solenoid for chafing or intermittent breaks
- 4Check transmission fluid condition
- 5Test TCC solenoid resistance when cold and when hot
- 6Check TCM power and ground connections
Recommended Parts & Tools
transmission wiring harness
electrical connector cleaner
transmission fluid
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $1500 |
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Frequently Asked Questions
Why does my car shudder at highway speed?
P0744 causes the torque converter clutch to lock and unlock rapidly at highway speed, creating a noticeable shudder or surge. It feels like the car is briefly losing and regaining power.
Can a wiring problem cause P0744?
Yes. Since P0744 is an intermittent code, a loose connection, corroded pin, or chafed wire is a very common cause. A wiggle test at the transmission connector while monitoring the TCC can confirm this.
Community Fix Reports
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