*Stolen from another website, check the end for additional possibility since you already replaced the selenoid*
DTC P0743 indicates "Torque Converter Clutch (TCC) Solenoid Circuit". This DTC is set when an open or shorted condition is detected in the torque converter clutch solenoid control circuit. Most likely it is a bad TCC solenoid but it can also be a problem with the wiring or ignition switch.
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Monday, June 4th, 2007 AT 5:27 AM