One problem related to hydraulic power assist steering system has been reported for the 1999 Cadillac Deville. The most recently reported issues are listed below.
Intermittent losses of power steering when making left turns.
| Steering Rack And Pinion problems | |
| Steering problems | |
| Power Steering Pump problems | |
| Hydraulic Power Assist Steering System problems | |
| Power Steering Hose, Piping, And Connections problems |