Toyota Motor Sales (TMS), U.S.A., Inc., will launch a Special Service Campaign involving certain 2004 and early 2005 model year Prius sold in the U.S.

On the involved vehicles, an issue with the program logic in the Electronic Control Module (ECM) system may cause some or all of the following warning lights to illuminate: Master, Hybrid System, Engine, Vehicle Stability Control, and Brake. If this occurs, the vehicle will enter a "fail-safe" mode which allows limited operation via the electric motor. However, the electrically-powered brake and steering operation will continue to function normally if this condition occurs. The electric motor will also provide enough power to allow the driver to pull the vehicle over and away from traffic. Once the vehicle is stopped, the driver may be able to restart the gasoline engine in the vehicle by pushing the start button.

Approximately 75,000 2004 and 2005 model year Prius vehicles may be affected by this condition. Toyota is proactively conducting a campaign in the interest of its customers.

Toyota will inform owners of the involved vehicles with a Special Service Campaign notification letter sent via first class mail beginning in late-October. Owners are requested to contact their local Toyota dealer for diagnosis and repair upon receiving their notification. Toyota will reprogram the ECM system at no charge to the owners of the vehicle. Also, in certain vehicles a special dielectric grease will be applied, at no charge, to a connector for the transaxle, which may cause a similar condition.

Customers with questions or concerns should contact the Toyota Customer Experience Center at 1-800-331-4331.