If the system fails, the car could suddenly become much harder to steer.
The cars involved are some 2004 Toyota Avalons, the 2004 and 2005 Camrys, Highlander S-U-Vs, Sienna Minivans, Solara convertibles, Lexus ES330 sedans and RX330 SUVs.
The 2006 Lexus RX400h hybrid S-U-V is also included in the recall.
No accidents or injuries have been reported. Owners will be told if their vehicle needs a free repair.