Conditions for Setting the DTC: P0815
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The BCM detects an upshift request for 3 seconds in PARK, REVERSE, NEUTRAL, or D1 and for 600 seconds in PARK, REVERSE, NEUTRAL, D2, or D1.