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What is a p1685 engine code on Chrysler 300m?

A P1685 code on a Chrysler 300M (and many other Chrysler vehicles) indicates a Powertrain Control Module (PCM) communication problem with the transmission control module (TCM). This means the PCM and TCM aren't communicating properly. The problem could lie within either module, the wiring harness connecting them, or a related ground circuit.