CDG2 is a confusing place to transfer. This terminal map might be of help.

Some tips:
- shuttle bus runs counter-clockwise. A few of them also include CDG1 and the RER terminal in their loops; do not take these if going to another CDG2 terminal and in a hurry
- the only way to cross over by foot from 2A/C to 2B/D is by the underground passage marked 'shops and services level' on the map. The entrance is not well marked, follow the stairs leading to the rental car agencies.
- said rental car agencies are located in that underground passage, and at terminal 2F. There is a much wider selection of cars at the central location than in 2F, in case of problems.
- the restaurant in the left corner of 2F is IMO by far the best eatery in CDG2.