My 99 caravan (3.0L) is doing the exact same thing and throwing the same codes. I've read some things about this here and there, but mostly the finger is pointing to the solenoid pack on the front of the tranny. Is this the component you are referring to?
I found the connector on the soleniod pack full of oil. I cleaned it and it seemed to help, but then the problem came back after a couple of months.
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99 Caravan
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