My '17 Prime Premium makes an annoyingly loud squeak every startup between 12-14 mph. I've gathered from the forums (both prius and other toyota forums) that's its an ABS self check. Anyone else have this happening? Mine started doing it around 4K miles and seems to only be getting louder with time!
My '18 Prime is new (100 miles) and as not done this. My previous cars (2 Venzas) did an single ABS check after each startup at around 8 mph and it was just a single mild thunk coming from the rear (drivers side?). No squeak. J