I think the relay you are referring to is at the top middle firewall. There will be two small relays, side by side. The one you want is on the left. It should have a large purple wire in it. Sometimes just wiggling this purple wire will give you all your forward gears back, if it's stuck in limp-in mode (2nd gear). At least it worked for me! Eventually I had to replace the relay; about $35-50.
automatic transmission solenoid switch latched in low/reverse position
The starter solenoid is on the starter. The transmission solenoids are in the solenoid pack on the front of the transmission.
That would be the solenoid pack.
It is called the solenoid pack.
Yes the solenoid pack is on the front of the transmission.
It is the rectangular block on the front of the trans case.
The 2010 Dodge Grand-Caravan has a 4-speed automatic.
The 2005 Dodge Grand-Caravan has a 4-speed automatic.
The 2001 Dodge Grand-Caravan has a 4-speed automatic.
The 2004 Dodge Grand-Caravan has a 4-speed automatic.
The 2002 Dodge Grand-Caravan has a 4-speed automatic.
The 2006 Dodge Grand-Caravan has a 4-speed automatic.