P0744
Torque Converter Clutch Circuit Intermittent
If your code reader dashboard displays the generic DTC error code P0744, your vehicle is currently experiencing an active failure related to "Torque Converter Clutch Circuit Intermittent". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
Storing code P0744 is your car's way of telling you something is wrong with the torque converter clutch circuit intermittent. Typical symptoms include engine rpm fluctuates at cruising speed, check engine light. You can typically drive short distances, but ignoring this code long-term will cause accelerated component wear and higher repair costs.
Symptoms
Engine RPM fluctuates at cruising speed, check engine light
Common Causes
- Intermittent wiring connection to TCC solenoid
- Failing TCC solenoid
- Dirty transmission fluid causing sticking valve
- Worn torque converter clutch lining
How to Fix
- 1 Check and repair transmission harness connector
- 2 Replace TCC solenoid
- 3 Perform a transmission fluid flush
- 4 Replace torque converter
Technical Explanation
Code P0744 is confirmed when the ECM's diagnostic algorithm detects a parameter deviation that persists across a defined number of consecutive drive cycles. The TCM also cross-references engine torque demand, throttle position, and vehicle speed to determine whether the actual gear ratio deviation is genuinely abnormal or a result of expected torque converter slip during aggressive acceleration. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
Medium-severity fault: the car functions but not optimally. The intermittent wiring connection to tcc solenoid issue will not resolve itself and will cause measurable long-term wear. A repair in the $150–$1800 range now avoids far higher costs later.
Mechanic's Pro Tip
For P0744, test the solenoid's coil resistance with a multimeter before ordering parts — most solenoids should read between 14 and 40 ohms; an open (infinite resistance) or short (near zero) confirms it's failed electrically. Also verify the PCM is commanding the solenoid by backprobing the connector with a test light during the relevant operating condition — if there's no command signal, the fault is in the PCM or wiring, not the solenoid itself.
Solenoid: $250 - $500; Torque Converter: $1,200+