Loud Rattle from Hybrid Vehicle Transmission [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
If ISC learning has not been performed, noise may occur in the hybrid vehicle transaxle assembly.
If noise occurs, initialize the learned values and perform idle learning.