Description: Reverse sensing system, 2007-09. Control module. Tahoe, Yukon, Escalade. Avalanche, Escalade EXT. Escalade ESV. Parking assist. Silverado, sierra hybrid. This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Collision parts are designed to help promote proper and safe repair