caravan shift prob

My 2000 Caravan, 3.3 auto has 85k on it. This morning the trans refused to shift up, so I'm in first gear. I also have reverse. The engine light came
on also. Have not pulled codes yet.
Any ideas this early w/ this info?
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Dave Lee wrote:

Output speed sensor on the transmission. Happened on the wife's last week. Easy fix.
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