2000 Grand Caravan - Wont Change Gears

IT sounds to me that the tranny is operating in "Limp" mode. A wonderful thing that the engineers at Chrysler thought would come in handy for whatever reason. Anyway, in addition to what has already been done try cleaning the plug and connector pins that plug into the Transmission Control Module. The plug is usually located on the top of the tranny nearest to the radiator and to the right of the exhaust manifold. It is usually held in place by a 10mm bolt. Loosen the bolt and unplug the harness. Clean it as best you can then add a little bit of dielectric grease to help in keeping moisture out of the connection. I have also been told that it could be a bad ground wire so you may want to check that also. Good Luck!

Having the precise problem with my '96 DGC. Wish we knew if the OP was able to fix the tranny and not replace it!!

Issue long resolved tranny was going into limp mode. Tranny had to be rebuilt.

mine was the shift solenoid on front of tranny . replaced 4 yr. age no problem

I replace solenoids in and out with torque converter still not shifting what could it be