ABS control-module failuremajor
The same failure that defines 2016 carries into 2017: the ABS module fails and disables anti-lock brakes, cruise, and traction control together, with the replacement part frequently on long backorder. Owners describe it as a widely known issue. Confirm all four systems work, scan for ABS/ESC codes, and if the seller claims it was replaced, ask for the invoice — a fresh module is a plus given the backorder history.
Sources: NHTSA complaint database, 2017 Ram 1500 · NHTSA recall database and manufacturer communications (recalls 17V434, 17V821, 25V010; diesel recalls)