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A P1861 code on a 2004 Pacifica indicates a problem with the Transmission Control Module (TCM) or the torque converter clutch (TCC) system. To fix it, start by checking the TCM connections and wiring for damage or corrosion. If the connections are fine, inspect the TCC solenoid and fluid levels, as low Transmission Fluid can cause issues. If these components are functioning properly, you may need to replace the TCM or have it reprogrammed.

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