For a dodge grand caravan Should engine code of P1684 cause the check light to come on?

Yes, engine code P1684 can cause the check light to come on in a Dodge Grand Caravan. The code indicates that there is a problem with the battery voltage sensing circuit. This can be caused by a number of issues, including a faulty battery, a bad connection, or a problem with the voltage regulator. If you see this code, you should have your vehicle diagnosed by a qualified mechanic as soon as possible.