Description: Tahoe, Yukon, Escalade. Silverado, sierra. Avalanche, Escalade EXT. Escalade ESV. Optional. 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 Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors