Diagnostic Codes?? P1782

Help Please! My check engine light has been coming on in my van (Grand Caravan) now for about 2 weeks. Sometimes on, sometimes off. Yesterday, I was going to pick up the kids and the van wouldn't shift gears. I parked it, turned it off, then back on and the van shifted fine. I drove it all day yesterday and no more problems. Then this morning, I got in to go to church, and it wouldn't shift again. I parked it, turned it off, back on, and low and behold it's ok again. I went to Auto Zone and had it "read" and the codes that came out were P1782 and P0700. I found the P0700 on the internet, it's Transmission Control System Malfunction. But I can't find the P1782 anywhere! Can someone help?

Hi!
The code p1782 means Performance/Economy Switch Circuit Out Of Self Test Range
Anyway, check this website:
http://www.autotap.com/codes.asp

Hope it helped.