The P0743 code for a Plymouth Neon indicates a problem with the torque converter clutch (TCC) circuit. To fix this issue, first, inspect the TCC solenoid and its wiring for any damage or disconnection. If everything appears intact, test the solenoid's resistance and functionality; it may need replacement if it's faulty. Additionally, check the Transmission Fluid level and condition, as low or dirty fluid can also contribute to this code.
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