The most likely cause would be low fluid level.
It can cause it to only have second and reverse gears.
Failed radiator transmission cooler.
Most likely the VSS. Vehicle Speed Sensor. It is mounted on the side of the transmission.
faulty speed sensor in the transmission
Well a lot of them have the same engines & transmissions; but if you have a lot of people you'll be driving around, you'd want the grand caravan...The only difference is the length. I would go with the standard size, it'll probably get better gas mileage and cause less wear on the transmission & engine.
Transmission mount
parking brake on.
Fix the cause, or keep adding fluid.
No, but it can cause the trans computer to not be able to communicate. that will cause not shifting.
Leave it turned off.... doh
when my dodge stratus started to do that it was because I needed transmission fluid.
it could either be a bad beattery or a bad starter