So, as I said (again), Guderian never commanded an Army Group
According to Mr Macksey (page 157), he did, albeit briefly, do so. Sort of. But not entirely explicitly.
At a meeting at Rosavl on 14/12/41, with Brauchitsch, Bock, & Kluge, he was assigned command of the Second Panzer Army, and also Second Army, although it was not named a heeresgruppe, merely "Provisional Army Guderian". A couple of weeks later he was relieved by Kluge, who had replaced the sacked Bock.
I infer this was possibly the "Heeresgruppe Abteilung Guderian" and if so might just qualify as an Army Group.
"You may find that having is not so nearly pleasing a thing as wanting. It is not logical, but it is often true."
- Cdr Spock