Good info from @alphawolff
in another thread about this defect. I will copy his post here and provide a link.
Hey everyone, factory tech here whose personally diagnosed these a decent amount of times this year.
To keep it simple the A drive motor has three resolvers: sin, cos, and excitement. In all cases I’ve seen, the cos resolver is shorting to the transmission case and causing a short to ground condition. It is either intermittent, and will cause a random stall, or shorts in such a way that you can instantly see it on a DMM and the vehicle won’t start and the code will be active
I believe the above poster is right is condemning the internal harness as faulty. It’s probably bad routing or some such.
I don’t see how a flash will solve this unless the flash is just to prevent the immediate stall condition. The problem isn’t common, but I do get about one of these a month coming into the shop and this is in socal with a **** high amount of hybrids on the road.
They might just send the recall flash and deal with the transmission failures as they come as they aren’t exactly common. The trans is covered under the 10 yr/150k mile hybrid warranty
Also, for those concerned with the dealers replacing the PIM, the reason for that is if the short isn’t present during testing the diagnostic flow chart leads to the replacement of the PIM. The first two I had we replaced the PIM first before replacing the transmission. Now when you go to make a Star case to order a PIM the star center will just tell you it’s the transmission and order that first to avoid that waste of time