Conditions for Setting the DTC: P0815
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The TCM detects an upshift request for 3 seconds or greater in PARK and TCM detects an upshift request for 600 seconds in D4 or D6.