High Idle Switch Programming

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Using the Tech 2, select Module Setup/PTO Options
Use soft keys to select desired settings.
When setting selections are complete, select Reprogram.

IMPORTANT: The ECM will not operate under the new value until the it has powered down once.

Turn OFF the ignition until communication with the ECM is lost, as indicated on the scan tool.
Start the vehicle and confirm the new settings by operating the high idle switch.