Jump Assist Description and Operation: Overview
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
A severely depleted hybrid drive motor battery may not have sufficient energy needed to crank/start the engine. In this case a scan tool may be used to place the accessory power module (APM) in a special operating mode called Jump Assist. The Jump Assist function allows on vehicle charging of the hybrid drive motor batteries using the 12 volt DC vehicle system.