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P0743 means Torque Converter Clutch Solenoid Circuit. Possible causes would be faulty torque converter clutch solenoid valve, torque converter clutch solenoid valve harness or connectors, torque converter clutch solenoid valve circuit is open or shorted, low transmission fluid level and dirty transmission fluid. Could be a problem to the harness to the TCC solenoid, the TCC solenoid connector or the TCC solenoid it self.
P0753 means 3-4 Shift Solenoid Relay. Possible causes would be a faulty shift solenoid valve,
shift solenoid valve harness or connectors, shift solenoid valve circuit is open or shorted, low transmission fluid level and dirty transmission fluid. The ECM has detected an open or shorted condition on the relay circuit.
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