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Q: 2002 jeep liberty error code 18 .what does it mean on 2002 Jeep Liberty

Was traveling about 70 miles hr and took exit when I came to stop it didn't down shift right away.Now I have to put it in 1st manually for it to go and now it won't shift in to over drive.Put meter on it and it comes up with error code 18 .No one seems to know what it means????
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