P0744 means Torque Converter Clutch Circuit Intermittent. The computer has seen the torque converter clutch circuit drop out intermittently, so lockup comes and goes. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0744 means
Electronically controlled automatics are run by a transmission control module (TCM), a separate box or part of the engine computer. It reads speed sensors, the range sensor and fluid temperature to decide when to shift, and drives solenoids that apply clutches and the torque converter clutch. Many basic code readers only show the generic P0700; a scan tool that reads the transmission module shows the specific fault. Check fluid level and condition first, since low or burnt fluid causes many transmission codes.
P0744 symptoms
- Shudder or surge at cruise
- Engine speed rising and falling at steady speed
- Lower fuel economy
Common causes of P0744
- Loose or corroded connector at the transmission case
- Chafed wiring
- Failing TCC solenoid
How to diagnose P0744
- Wiggle-test the transmission harness while watching TCC status
- Inspect the case connector for fluid intrusion
- Check solenoid resistance hot and cold
Can you drive with P0744?
Usually yes, but avoid towing until repaired.
P0744 tips
Intermittent TCC codes are often electrical: the transmission case connector can leak fluid into the harness, and heat makes marginal connections open. Clean or replace the connector before replacing the solenoid or converter.
Will P0744 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0744 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0740 | Torque Converter Clutch Circuit Malfunction |
| P0741 | Torque Converter Clutch Circuit Performance or Stuck Off |
| P0700 | Transmission Control System Malfunction |
Guides that help
When it is more than a sensor
If the fault turns out to be internal (worn clutches, a failed converter or a damaged valve body), compare a rebuild with a replacement in transmission rebuild vs replacement and transmission replacement cost, identify your unit with what transmission do I have?, and browse our transmissions.
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