Electric power-steering lossmajor
Sudden or intermittent loss of power-steering assist is a recurring theme across the 2016–2019 trucks. Recall 16V167 covered a 2015–2016 EPS circuit-board short, but the complaint file also carries out-of-recall failures where owners are told the steering gear isn't covered. Losing assist at low speed makes the truck very hard to turn. Confirm recall 16V167 was completed by VIN and that steering effort is normal and consistent on the test drive.
Sources: NHTSA complaint database, 2016 Ram 1500 · NHTSA recall database and manufacturer communications (recalls 16V167, 17V821, 25V010; diesel recalls)