Engine Drag Control
WARNING: This page is about a different car, the 2011 GMC Cab & Chassis Sierra, 2011 Chevrolet Suburban, and 2011 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
When the driver releases the throttle, and the drag from the engine overcomes the frictional force between the tire and the road, engine drag control becomes active.
The EBCM sends a torque request signal to the ECM, which increases the torque at the wheels. This stabilizes the wheels by reducing the slip at the driven wheels.
When engine drag control is active, the driven wheels are controlled to a target below the non-driven wheels.