i pulled the code u2106- lost comm. w/trans system. what does this mean? on 2000 Saturn LS

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my problem is the car idles good and takes rpm in park but once in gear it wont move or take rpm.
(1) Answer
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When you have u code means the class 2 network is having comuation problem with the computer in the network, You can not get to this with a scanner, there are testing to be done to fix this, Best advice you should send is to a shop, to some who understand the class 2 network on a car, most shop dont understand this, We do these kind of repair.
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