The tensions continued and apparently reached a breaking point in 1737, when there was a conflict between the villagers and the castle lord, which ended with violence and the death of two men, with several wounded.

The Count fled with his son, and in the proceedings that followed they eventually sold their title to the castle to Duke Karl Eugen, and the village came under the jurisdiction of the Duchy of Wurttemberg.

In the late 1800s, with better roads, some of the inhabitants began to work in the quarries and factories of the nearby city of Heilbronn, at one point one of the leading paper manufacturers in Germany.

Although the majority of Untergruppenbach's contemporary residents work in the district of Heilbronn, many are still employed within the municipality or in nearby villages.

Viticulture plays a major part in contemporary Untergruppenbach, with the hill upon which Burg Stettenfels stands itself serving as a sloping vineyard.

The municipality shares a strong sense of community, with a large number of leisure and sports associations, as well as a volunteer fire brigade.

For local amusement, Untergruppenbach has a fine municipal swimming pool with heated facilities, as well as the TSV sports center, where any number of physical activities can be practiced, amongst them tennis and soccer.

Nearby villages include Flein, Abstatt, Ilsfeld, Beilstein, Löwenstein, Talheim, Brackenheim and Auenstein.