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The P0740 code on a 1997 Chevy Lumina indicates a problem with the torque converter clutch (TCC) system. To repair it, start by checking the Transmission Fluid level and condition, as low or dirty fluid can cause issues. Next, inspect the TCC solenoid, wiring, and connectors for damage or corrosion. If these components are functioning properly, you may need to consider a more in-depth diagnosis or potential replacement of the torque converter itself.

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3d ago

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