What Does P0744 Mean?
The torque converter clutch (TCC) solenoid circuit is exhibiting intermittent electrical behavior. The PCM/TCM has detected the TCC solenoid signal dropping in and out, causing erratic TCC engagement and disengagement. This typically manifests as a shudder or surge at highway speeds as the converter locks and unlocks unpredictably.
Common Causes
35%
Loose or corroded connection at the transmission connector causing intermittent contact
25%
Chafed or damaged wiring making intermittent contact (insulation worn through)
20%
TCC solenoid with intermittent internal coil failure (thermal-related open)
12%
Marginal TCM/PCM solenoid driver circuit
8%
Intermittent ground connection for the solenoid circuit
Diagnostic Steps
1
Wiggle-test the transmission connector and wiring harness while monitoring TCC solenoid voltage on a DVOM or oscilloscope — watch for signal dropouts.
2
Inspect the transmission connector for corroded pins, loose terminals, or damaged seals that allow water intrusion.
3
Monitor TCC slip RPM via live data during highway driving — intermittent spikes in slip RPM confirm erratic TCC engagement.
4
Measure TCC solenoid resistance cold and then warm — an intermittent open will often show up when the solenoid is hot.
5
Inspect the internal transmission wiring harness for signs of heat damage, chafing, or broken solder joints at the solenoid connector.
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The torque converter clutch (TCC) solenoid circuit is exhibiting intermittent electrical behavior. The PCM/TCM has detected the TCC solenoid signal dropping in and out, causing erratic TCC engagement and disengagement. This typically manifests as a shudder or surge at highway speeds as the converter...
The most common cause of P0744 (Torque Converter Clutch Circuit Intermittent) is: Loose or corroded connection at the transmission connector causing intermittent contact
Typical repair costs for P0744 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is drivable but may experience surging or shuddering at highway speeds, which can be distracting. The erratic TCC behavior also generates extra heat in the torque converter. Repair within the next few weeks to avoid converter or transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0744 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission — Torque Converter
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
