Will not shift into 3rd gear why? on 2000 Chrysler Voyager

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I have a 2000 Chrysler Voyager. The check engine light has cam on and it will not shift into 3rd gear. At 40mph the van is at 3500 rpms. Any suggestions to what the problem is and easiest/cheapest way to fix this problem?
(2) Answers
You need to get a diagnostic scan done at a transmission shop to determine what has failed in the transmission.
You have a Chrysler minivan. Unfortunately these transmissions on the vans, actually on MOST all older Chryslers are junk. Get ready to have to replace transmission :( Do a google search on Chrysler transmission problems.

Scroll about a 1/4 way down on that site...