What tool was used to read it? I've been seeing more and more threads (some say they're using Dr. Prius?) where the second position of the DTC is wrong. Sometimes it's even obviously bogus, like a letter or a number above 3, which the second position of a DTC can't ever be. 1 at least is a possible second digit, but P1A80 sure isn't a Prius code I've heard of before.
There is very definitely a P0A80 code that pertains to the traction battery. It gets mentioned on PriusChat a lot. If you have some inside info on a P1A80 code, then, please, spill!
trani fluid code. happens when the shifting is not as smooth as usual especially when it shifts into 6th gear.
