Travel to Caen from CDG on the GTV train

Any suggestions about what? Also, I think you mean TGV. In any event, to get to Caen from CDG, you will have to go into Paris and catch a train at Gare Saint-Lazare. I am not sure that any TGVs even run on that route but maybe someone with more knowledge will chime in.

Easiest is probably to take Roissybus to Opera, walk 10 minutes to St. Lazare, and take the train from there. You can buy the needed tickets when you are here.

No TGV trains to Caen and only one route out of St Lazare. It’s regional trains that take two hours or less. Nothing to choose other than departure time. As others noted you have to make your way to St Lazare. (Take a fixed price taxi from CDG)

Look at the man in seat 61 for an explanation of service to Caen and other cities in the region.

All good advice so far. No TGV to Caen. I am usually alone so I take the RoissyBus from CDG to Gare Saint-Lazare (€13 per person) and the train from there. If I were with two or more or with a lot of luggage, the fixed rate taxi is a good option (€56 for one taxi—up to four people). Both leave right outside of arrivals. Don't take a taxi from anyone inside of the airport.