If you know that the torque converter is actually working correctly, I would unhook the battery which will then erase the memory on your computer diagnostic codes and re-check. If the code does not pop back up again when you try to diagnose any engine problems, you have reset the computer, it will also indicate that the torque converter is fine and all you did was pull up a faulty code.
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Ok, The other day I had a "service Engine Soon" light. The car was shifting really hard, and slamming into each gear. I have found that if I pull over, take my code reader and plug it in, I get a PO742 code. Torque converter circuit stuck on. I proceed to erase that code from the computer, and restart the car and it will run and drive totally fine, as if nothing is wrong. I have been doing it this way for 3 years and the car is running fine to this day. It hasn't cost me a dime in repairs, and I commute 500 miles/week. It's worth a try, because I have heard that if you spend 800-900 bucks to get it "fixed", the problem WILL return some day.
Trouble Code: P0742
This should be looked at by a trusted transmission shop in your area to address this problem. This sometimes does require the replacement of the torque converter itself.
Torque Converter Clutch Circuit Stuck On (4T65-E)
TCC PWM solenoid valve for the fluid exhaust is restrictedTCC regulated apply valve is stuck in the TCC apply positionTCC control valve is stuck in the TCC apply positionTCC feed limit valve is stuck (i.e., the TCC feed limit pressure, and the TCC release pressure to be low or nonexistent)Pressure regulator valve is stuckTCC fluid circuits leaking or abnormally low/high line pressureTCC release switch circuit is shorted to groundTSB 00-07-30-007A contains a repair procedure for this code
TORQUE CONVERTER CLUTCH SYSTEM STUCK ON.PROBLEM COULD BE PRESSURE REGULATOR VALVE IS STUCK.OR THE TCC FLUID CIRCUITS LEAKING OR ABNORMALLY LOW HIGH LINE PRESSURE.OR THE TCC RELEASE SWITCH CIRCUIT IS SHORTED TO GROUND.CHECK TRANSMISSION FLUID LEVEL.IF TRANSMISSION FLUID LOOKS REAL DARK LOOKING AND SMELLY .CHANGE THE FLUID AND FILTER.IF THIS DONT HELP ! YOUR PROBLEM COULD BE A BAD TORQUE CONVERTER CLUTCH SOLENOID OR INTERNAL DAMAGE INSIDE TORQUE CONVERTER.OR RESTRICTION IN OIL PASSAGES AND STOPPED UP OR BLOCKED TCC SCREEN.