Conditions for Setting the DTC: P0AAD
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.
The hybrid battery cooling fan is ON and the difference between sensor 1 and 2 is greater than 10°C (18°F) difference for 9 seconds.