It is the rectangular block on the front of the trans case.
Loose hold down clamp or broken shift cable.
It is part of the 6 in by 2 in by 4 in tall "brick" on the front of the trans.
Low trans fluid, or internal trans failure.
Starter solenoid is on the starter, trans solenoid is on the trans.
The 2003 Dodge Grand-Caravan has a 4-speed automatic.
Inside the trans pan.
You add trans fluid down the trans dipstick tube.
Down the trans dipstick tube.
Inside the pan on the bottom of the trans.
Between the radiator and the ac condenser.
Never heard of a modulator valve on a caravan is it for the trans? Chrysler transmisions do not have modulator valves