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What is Ford transmission code 781?

Ford transmission code 781 refers to a Torque Converter Clutch (TCC) Apply Circuit malfunction. This means the computer is detecting a problem with the electrical circuit that controls the torque converter clutch. The TCC is responsible for locking the torque converter at higher speeds, improving fuel economy and performance. A malfunctioning TCC can lead to slipping, rough shifting, and potentially other transmission issues.
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