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P1684 Dodge Caravan . As for the engine, the dodge dealers changed the main computer chip after the first. That works for my 02 dodge grand caravan for the same code, which unhooking the battery durning maitnence might of been the cause of p1684. I have changed the ignition coil pack, starter relay and battery. 2001 Champagne Pearl Dodge Grand Caravan Sport 39598612 from gtcarlot.com What’s interesting about this code is that it doesn. The diagnostic trouble code (dtc) p1684 will set when the transmission control module (tcm) is disconnected from battery voltage or ground.