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Transmission on 2001 Audi A6 Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Reverse works on level ground, however, if backing up hill will not back. Does this require new trans or some kind of adjustment and/or flush?
(1) Answer
If the transmission will not operate under the pressure of going up a hill the problem is most likely in the transmission unfortunately. I would first have someone with a scan tool that has Audi diagnostic capabilities plug in a scan tool and see if the transmission has any trouble codes stored. Have the transmission fluid level checked.